55777290 has 16 divisors (see below), whose sum is σ = 133865568. Its totient is φ = 14873936.

The previous prime is 55777283. The next prime is 55777313. The reversal of 55777290 is 9277755.

It is a super-2 number, since 2×55777290² = 6222212159488200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929592 + ... + 929651.

It is an arithmetic number, because the mean of its divisors is an integer number (8366598).

Almost surely, 2^55777290 is an apocalyptic number.

55777290 is an abundant number, since it is smaller than the sum of its proper divisors (78088278).

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

55777290 is a wasteful number, since it uses less digits than its factorization.

55777290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859253.

The product of its (nonzero) digits is 154350, while the sum is 42.

The square root of 55777290 is about 7468.4195115165. The cubic root of 55777290 is about 382.0783854568.

The spelling of 55777290 in words is "fifty-five million, seven hundred seventy-seven thousand, two hundred ninety".