55780988 has 12 divisors (see below), whose sum is σ = 97673520. Its totient is φ = 27874272.

The previous prime is 55780973. The next prime is 55781009. The reversal of 55780988 is 88908755.

It is a super-2 number, since 2×55780988² = 6223037244512288, 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 3 ways as a sum of consecutive naturals, for example, 7073 + ... + 12711.

It is an arithmetic number, because the mean of its divisors is an integer number (8139460).

Almost surely, 2^55780988 is an apocalyptic number.

It is an amenable number.

55780988 is a deficient number, since it is larger than the sum of its proper divisors (41892532).

55780988 is a wasteful number, since it uses less digits than its factorization.

55780988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8116 (or 8114 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 50.

The square root of 55780988 is about 7468.6670832217. The cubic root of 55780988 is about 382.0868291241.

The spelling of 55780988 in words is "fifty-five million, seven hundred eighty thousand, nine hundred eighty-eight".