55321904 has 20 divisors (see below), whose sum is σ = 116930760. Its totient is φ = 25146240.

The previous prime is 55321897. The next prime is 55321909. The reversal of 55321904 is 40912355.

It is not an unprimeable number, because it can be changed into a prime (55321909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156989 + ... + 157340.

It is an arithmetic number, because the mean of its divisors is an integer number (5846538).

Almost surely, 2^55321904 is an apocalyptic number.

It is an amenable number.

55321904 is an abundant number, since it is smaller than the sum of its proper divisors (61608856).

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

55321904 is a wasteful number, since it uses less digits than its factorization.

55321904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314348 (or 314342 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 55321904 is about 7437.8695874558. The cubic root of 55321904 is about 381.0357339791.

The spelling of 55321904 in words is "fifty-five million, three hundred twenty-one thousand, nine hundred four".