55199904 has 48 divisors (see below), whose sum is σ = 145283040. Its totient is φ = 18351360.

The previous prime is 55199891. The next prime is 55199923. The reversal of 55199904 is 40999155.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

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, 67659 + ... + 68469.

It is an arithmetic number, because the mean of its divisors is an integer number (3026730).

Almost surely, 2^55199904 is an apocalyptic number.

It is an amenable number.

55199904 is an abundant number, since it is smaller than the sum of its proper divisors (90083136).

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

55199904 is a wasteful number, since it uses less digits than its factorization.

55199904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533 (or 1525 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 55199904 is about 7429.6637878171. The cubic root of 55199904 is about 380.7554316646.

The spelling of 55199904 in words is "fifty-five million, one hundred ninety-nine thousand, nine hundred four".