55023138 has 20 divisors (see below), whose sum is σ = 123292950. Its totient is φ = 18340992.

The previous prime is 55023127. The next prime is 55023139. The reversal of 55023138 is 83132055.

It can be written as a sum of positive squares in only one way, i.e., 32867289 + 22155849 = 5733^2 + 4707^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (55023139) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 169663 + ... + 169986.

Almost surely, 2^55023138 is an apocalyptic number.

55023138 is an abundant number, since it is smaller than the sum of its proper divisors (68269812).

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

55023138 is a wasteful number, since it uses less digits than its factorization.

55023138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339663 (or 339654 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 55023138 is about 7417.7582867063. The cubic root of 55023138 is about 380.3485675172.

The spelling of 55023138 in words is "fifty-five million, twenty-three thousand, one hundred thirty-eight".