51644138 has 32 divisors (see below), whose sum is σ = 97305600. Its totient is φ = 20427120.

The previous prime is 51644111. The next prime is 51644183. The reversal of 51644138 is 83144615.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6023 + ... + 11813.

It is an arithmetic number, because the mean of its divisors is an integer number (3040800).

Almost surely, 2^51644138 is an apocalyptic number.

51644138 is a deficient number, since it is larger than the sum of its proper divisors (45661462).

51644138 is a wasteful number, since it uses less digits than its factorization.

51644138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5827 (or 5813 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 51644138 is about 7186.3856005644. The cubic root of 51644138 is about 372.3977179652.

The spelling of 51644138 in words is "fifty-one million, six hundred forty-four thousand, one hundred thirty-eight".