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55451880 = 233251121967
BaseRepresentation
bin1101001110001…
…0000011101000
310212100020200100
43103202003220
5103143430010
65300305400
71242222201
oct323420350
9125306610
1055451880
1129334900
12166a2260
13b646a83
1475165a8
154d052c0
hex34e20e8

55451880 has 288 divisors, whose sum is σ = 211629600. Its totient is φ = 12545280.

The previous prime is 55451843. The next prime is 55451911. The reversal of 55451880 is 8815455.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 827607 + ... + 827673.

It is an arithmetic number, because the mean of its divisors is an integer number (734825).

Almost surely, 255451880 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 55451880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105814800).

55451880 is an abundant number, since it is smaller than the sum of its proper divisors (156177720).

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

55451880 is a wasteful number, since it uses less digits than its factorization.

55451880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 55451880 is about 7446.6019095961. The cubic root of 55451880 is about 381.3339086119. Note that the first 3 decimals are identical.

The spelling of 55451880 in words is "fifty-five million, four hundred fifty-one thousand, eight hundred eighty".