55538138 has 4 divisors (see below), whose sum is σ = 83307210. Its totient is φ = 27769068.

The previous prime is 55538137. The next prime is 55538141. The reversal of 55538138 is 83183555.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 47375689 + 8162449 = 6883^2 + 2857^2 .

It is not an unprimeable number, because it can be changed into a prime (55538137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13884533 + ... + 13884536.

Almost surely, 2^55538138 is an apocalyptic number.

55538138 is a deficient number, since it is larger than the sum of its proper divisors (27769072).

55538138 is a wasteful number, since it uses less digits than its factorization.

55538138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27769071.

The product of its digits is 72000, while the sum is 38.

The square root of 55538138 is about 7452.3914282598. The cubic root of 55538138 is about 381.5315337686.

The spelling of 55538138 in words is "fifty-five million, five hundred thirty-eight thousand, one hundred thirty-eight".