55811520 has 84 divisors (see below), whose sum is σ = 191978280. Its totient is φ = 14882304.

The previous prime is 55811453. The next prime is 55811543. The reversal of 55811520 is 2511855.

55811520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55811520² = 6229851529420800, which contains 22 as substring.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 6810 + ... + 12569.

Almost surely, 2^55811520 is an apocalyptic number.

It is an amenable number.

55811520 is an abundant number, since it is smaller than the sum of its proper divisors (136166760).

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

55811520 is a wasteful number, since it uses less digits than its factorization.

55811520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19402 (or 19389 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 55811520 is about 7470.7108095549. The cubic root of 55811520 is about 382.1565287815.

The spelling of 55811520 in words is "fifty-five million, eight hundred eleven thousand, five hundred twenty".