55139856 has 20 divisors (see below), whose sum is σ = 142444752. Its totient is φ = 18379936.

The previous prime is 55139831. The next prime is 55139863. The reversal of 55139856 is 65893155.

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, 574326 + ... + 574421.

Almost surely, 2^55139856 is an apocalyptic number.

It is an amenable number.

55139856 is an abundant number, since it is smaller than the sum of its proper divisors (87304896).

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

55139856 is a wasteful number, since it uses less digits than its factorization.

55139856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148758 (or 1148752 counting only the distinct ones).

The product of its digits is 162000, while the sum is 42.

The square root of 55139856 is about 7425.6215901431. The cubic root of 55139856 is about 380.6173161000.

The spelling of 55139856 in words is "fifty-five million, one hundred thirty-nine thousand, eight hundred fifty-six".