55138816 has 20 divisors (see below), whose sum is σ = 110170962. Its totient is φ = 27569152.

The previous prime is 55138807. The next prime is 55138819. The reversal of 55138816 is 61883155.

It can be written as a sum of positive squares in only one way, i.e., 37161216 + 17977600 = 6096^2 + 4240^2 .

It is not an unprimeable number, because it can be changed into a prime (55138819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53335 + ... + 54358.

Almost surely, 2^55138816 is an apocalyptic number.

It is an amenable number.

55138816 is a deficient number, since it is larger than the sum of its proper divisors (55032146).

55138816 is an equidigital number, since it uses as much as digits as its factorization.

55138816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107711 (or 107695 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 55138816 is about 7425.5515620053. The cubic root of 55138816 is about 380.6149231273.

The spelling of 55138816 in words is "fifty-five million, one hundred thirty-eight thousand, eight hundred sixteen".