55788720 has 80 divisors (see below), whose sum is σ = 186258912. Its totient is φ = 13731840.

The previous prime is 55788703. The next prime is 55788727. The reversal of 55788720 is 2788755.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×55788720² = 6224762558476800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55788727) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5821 + ... + 12060.

Almost surely, 2^55788720 is an apocalyptic number.

It is an amenable number.

55788720 is an abundant number, since it is smaller than the sum of its proper divisors (130470192).

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

55788720 is a wasteful number, since it uses less digits than its factorization.

55788720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17910 (or 17904 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 55788720 is about 7469.1846944630. The cubic root of 55788720 is about 382.1044824440.

The spelling of 55788720 in words is "fifty-five million, seven hundred eighty-eight thousand, seven hundred twenty".