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61451140 = 2253072557
BaseRepresentation
bin1110101001101…
…0101110000100
311021122001010011
43222122232010
5111212414030
610033040004
71344216562
oct352325604
9137561104
1061451140
1131762173
12186b6004
13c96762a
148238a32
1555dcb2a
hex3a9ab84

61451140 has 12 divisors (see below), whose sum is σ = 129047436. Its totient is φ = 24580448.

The previous prime is 61451113. The next prime is 61451161. The reversal of 61451140 is 4115416.

61451140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 14884164 + 46566976 = 3858^2 + 6824^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1536259 + ... + 1536298.

It is an arithmetic number, because the mean of its divisors is an integer number (10753953).

Almost surely, 261451140 is an apocalyptic number.

It is an amenable number.

61451140 is an abundant number, since it is smaller than the sum of its proper divisors (67596296).

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

61451140 is a wasteful number, since it uses less digits than its factorization.

61451140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3072566 (or 3072564 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 61451140 is about 7839.0777518787. The cubic root of 61451140 is about 394.6177790649.

Adding to 61451140 its reverse (4115416), we get a palindrome (65566556).

The spelling of 61451140 in words is "sixty-one million, four hundred fifty-one thousand, one hundred forty".

Divisors: 1 2 4 5 10 20 3072557 6145114 12290228 15362785 30725570 61451140