231775638 has 32 divisors (see below), whose sum is σ = 471102720. Its totient is φ = 76010400.

The previous prime is 231775631. The next prime is 231775667. The reversal of 231775638 is 836577132.

It is a self number, because there is not a number n which added to its sum of digits gives 231775638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231775631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97581 + ... + 99927.

It is an arithmetic number, because the mean of its divisors is an integer number (14721960).

Almost surely, 2^231775638 is an apocalyptic number.

231775638 is an abundant number, since it is smaller than the sum of its proper divisors (239327082).

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

231775638 is a wasteful number, since it uses less digits than its factorization.

231775638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2612.

The product of its digits is 211680, while the sum is 42.

The square root of 231775638 is about 15224.1793867519. The cubic root of 231775638 is about 614.2652233346.

The spelling of 231775638 in words is "two hundred thirty-one million, seven hundred seventy-five thousand, six hundred thirty-eight".