55139688 has 48 divisors (see below), whose sum is σ = 149834880. Its totient is φ = 18318624.

The previous prime is 55139681. The next prime is 55139719. The reversal of 55139688 is 88693155.

55139688 is a `hidden beast` number, since 551 + 3 + 96 + 8 + 8 = 666.

55139688 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 (55139681) 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 11 ways as a sum of consecutive naturals, for example, 23881 + ... + 26087.

It is an arithmetic number, because the mean of its divisors is an integer number (3121560).

Almost surely, 2^55139688 is an apocalyptic number.

It is an amenable number.

55139688 is an abundant number, since it is smaller than the sum of its proper divisors (94695192).

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

55139688 is a wasteful number, since it uses less digits than its factorization.

55139688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566 (or 2559 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 55139688 is about 7425.6102779502. The cubic root of 55139688 is about 380.6169295449.

The spelling of 55139688 in words is "fifty-five million, one hundred thirty-nine thousand, six hundred eighty-eight".