51993638 has 16 divisors (see below), whose sum is σ = 79073280. Its totient is φ = 25638600.

The previous prime is 51993637. The next prime is 51993653. The reversal of 51993638 is 83639915.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51993637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49523 + ... + 50561.

It is an arithmetic number, because the mean of its divisors is an integer number (4942080).

Almost surely, 2^51993638 is an apocalyptic number.

51993638 is a deficient number, since it is larger than the sum of its proper divisors (27079642).

51993638 is a wasteful number, since it uses less digits than its factorization.

51993638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363.

The product of its digits is 174960, while the sum is 44.

The square root of 51993638 is about 7210.6614121036. The cubic root of 51993638 is about 373.2358931148.

The spelling of 51993638 in words is "fifty-one million, nine hundred ninety-three thousand, six hundred thirty-eight".