55290978 has 32 divisors (see below), whose sum is σ = 125193600. Its totient is φ = 18081648.

The previous prime is 55290971. The next prime is 55290979. The reversal of 55290978 is 87909255.

It is a happy number.

55290978 is a `hidden beast` number, since 552 + 9 + 0 + 97 + 8 = 666.

55290978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (55290971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6798 + ... + 12521.

It is an arithmetic number, because the mean of its divisors is an integer number (3912300).

Almost surely, 2^55290978 is an apocalyptic number.

55290978 is an abundant number, since it is smaller than the sum of its proper divisors (69902622).

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

55290978 is a wasteful number, since it uses less digits than its factorization.

55290978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19383 (or 19377 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 55290978 is about 7435.7903413154. The cubic root of 55290978 is about 380.9647186624.

The spelling of 55290978 in words is "fifty-five million, two hundred ninety thousand, nine hundred seventy-eight".