55391504 has 20 divisors (see below), whose sum is σ = 122652864. Its totient is φ = 23739168.

The previous prime is 55391489. The next prime is 55391543. The reversal of 55391504 is 40519355.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247172 + ... + 247395.

Almost surely, 2^55391504 is an apocalyptic number.

It is an amenable number.

55391504 is an abundant number, since it is smaller than the sum of its proper divisors (67261360).

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

55391504 is a wasteful number, since it uses less digits than its factorization.

55391504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494582 (or 494576 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 55391504 is about 7442.5468759021. The cubic root of 55391504 is about 381.1954595813.

The spelling of 55391504 in words is "fifty-five million, three hundred ninety-one thousand, five hundred four".