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51054640 = 2457137013
BaseRepresentation
bin1100001011000…
…0100000110000
310120001211210121
43002300200300
5101032222030
65022140024
71156646230
oct302604060
9116054717
1051054640
112690111a
1215121614
13a767460
146acdcc0
15473747a
hex30b0830

51054640 has 80 divisors (see below), whose sum is σ = 146115648. Its totient is φ = 16155648.

The previous prime is 51054629. The next prime is 51054649. The reversal of 51054640 is 4645015.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (51054649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3774 + ... + 10786.

Almost surely, 251054640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51054640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73057824).

51054640 is an abundant number, since it is smaller than the sum of its proper divisors (95061008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51054640 is a wasteful number, since it uses less digits than its factorization.

51054640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7046 (or 7040 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 51054640 is about 7145.2529696296. The cubic root of 51054640 is about 370.9753666535.

Adding to 51054640 its reverse (4645015), we get a palindrome (55699655).

The spelling of 51054640 in words is "fifty-one million, fifty-four thousand, six hundred forty".

Divisors: 1 2 4 5 7 8 10 13 14 16 20 26 28 35 40 52 56 65 70 80 91 104 112 130 140 182 208 260 280 364 455 520 560 728 910 1040 1456 1820 3640 7013 7280 14026 28052 35065 49091 56104 70130 91169 98182 112208 140260 182338 196364 245455 280520 364676 392728 455845 490910 561040 638183 729352 785456 911690 981820 1276366 1458704 1823380 1963640 2552732 3190915 3646760 3927280 5105464 6381830 7293520 10210928 12763660 25527320 51054640