55780776 has 24 divisors (see below), whose sum is σ = 151073130. Its totient is φ = 18593568.

The previous prime is 55780771. The next prime is 55780799. The reversal of 55780776 is 67708755.

55780776 is a `hidden beast` number, since 5 + 578 + 0 + 7 + 76 = 666.

It can be written as a sum of positive squares in only one way, i.e., 54022500 + 1758276 = 7350^2 + 1326^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×55780776² = 6222989942324352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55780771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 387295 + ... + 387438.

Almost surely, 2^55780776 is an apocalyptic number.

It is an amenable number.

55780776 is an abundant number, since it is smaller than the sum of its proper divisors (95292354).

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

55780776 is a wasteful number, since it uses less digits than its factorization.

55780776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774745 (or 774738 counting only the distinct ones).

The product of its (nonzero) digits is 411600, while the sum is 45.

The square root of 55780776 is about 7468.6528905821. The cubic root of 55780776 is about 382.0863450732.

The spelling of 55780776 in words is "fifty-five million, seven hundred eighty thousand, seven hundred seventy-six".