51638205 has 16 divisors (see below), whose sum is σ = 83381760. Its totient is φ = 27286848.

The previous prime is 51638179. The next prime is 51638261. The reversal of 51638205 is 50283615.

It is not a de Polignac number, because 51638205 - 2⁷ = 51638077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14157 + ... + 17426.

It is an arithmetic number, because the mean of its divisors is an integer number (5211360).

Almost surely, 2^51638205 is an apocalyptic number.

It is an amenable number.

51638205 is a deficient number, since it is larger than the sum of its proper divisors (31743555).

51638205 is a wasteful number, since it uses less digits than its factorization.

51638205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31700.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 51638205 is about 7185.9727942708. The cubic root of 51638205 is about 372.3834567772.

The spelling of 51638205 in words is "fifty-one million, six hundred thirty-eight thousand, two hundred five".