55139508 has 24 divisors (see below), whose sum is σ = 142954560. Its totient is φ = 18379800.

The previous prime is 55139489. The next prime is 55139537. The reversal of 55139508 is 80593155.

It is a happy number.

55139508 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 255168 + ... + 255383.

It is an arithmetic number, because the mean of its divisors is an integer number (5956440).

Almost surely, 2^55139508 is an apocalyptic number.

It is an amenable number.

55139508 is an abundant number, since it is smaller than the sum of its proper divisors (87815052).

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

55139508 is a wasteful number, since it uses less digits than its factorization.

55139508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510564 (or 510556 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 55139508 is about 7425.5981577244. The cubic root of 55139508 is about 380.6165153779.

The spelling of 55139508 in words is "fifty-five million, one hundred thirty-nine thousand, five hundred eight".