55761520 has 20 divisors (see below), whose sum is σ = 129645720. Its totient is φ = 22304576.

The previous prime is 55761491. The next prime is 55761551. The reversal of 55761520 is 2516755.

55761520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×55761520² = 6218694225420800, 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 3 ways as a sum of consecutive naturals, for example, 348430 + ... + 348589.

It is an arithmetic number, because the mean of its divisors is an integer number (6482286).

Almost surely, 2^55761520 is an apocalyptic number.

It is an amenable number.

55761520 is an abundant number, since it is smaller than the sum of its proper divisors (73884200).

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

55761520 is a wasteful number, since it uses less digits than its factorization.

55761520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697032 (or 697026 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 55761520 is about 7467.3636579452. The cubic root of 55761520 is about 382.0423735238.

The spelling of 55761520 in words is "fifty-five million, seven hundred sixty-one thousand, five hundred twenty".