55770918 has 24 divisors (see below), whose sum is σ = 129753432. Its totient is φ = 15934464.

The previous prime is 55770917. The next prime is 55770941. The reversal of 55770918 is 81907755.

It is a super-2 number, since 2×55770918² = 6220790589125448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 55770918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55770917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94555 + ... + 95142.

It is an arithmetic number, because the mean of its divisors is an integer number (5406393).

Almost surely, 2^55770918 is an apocalyptic number.

55770918 is an abundant number, since it is smaller than the sum of its proper divisors (73982514).

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

55770918 is a wasteful number, since it uses less digits than its factorization.

55770918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189716 (or 189709 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 55770918 is about 7467.9929030497. The cubic root of 55770918 is about 382.0638353523.

The spelling of 55770918 in words is "fifty-five million, seven hundred seventy thousand, nine hundred eighteen".