55871520 has 192 divisors, whose sum is σ = 192036096. Its totient is φ = 13598720.

The previous prime is 55871509. The next prime is 55871549. The reversal of 55871520 is 2517855.

It is a happy number.

It is a super-2 number, since 2×55871520² = 6243253494220800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 334477 + ... + 334643.

It is an arithmetic number, because the mean of its divisors is an integer number (1000188).

Almost surely, 2^55871520 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 55871520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96018048).

55871520 is an abundant number, since it is smaller than the sum of its proper divisors (136164576).

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

55871520 is a wasteful number, since it uses less digits than its factorization.

55871520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 55871520 is about 7474.7254130169. The cubic root of 55871520 is about 382.2934251302.

The spelling of 55871520 in words is "fifty-five million, eight hundred seventy-one thousand, five hundred twenty".