231657997284 has 72 divisors (see below), whose sum is σ = 675488818368. Its totient is φ = 65569412160.

The previous prime is 231657997271. The next prime is 231657997301. The reversal of 231657997284 is 482799756132.

231657997284 is a `hidden beast` number, since 2 + 31 + 6 + 579 + 9 + 7 + 28 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4268727 + ... + 4322654.

It is an arithmetic number, because the mean of its divisors is an integer number (9381789144).

Almost surely, 2^231657997284 is an apocalyptic number.

It is an amenable number.

231657997284 is an abundant number, since it is smaller than the sum of its proper divisors (443830821084).

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

231657997284 is a wasteful number, since it uses less digits than its factorization.

231657997284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8591505 (or 8591500 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 231657997284 in words is "two hundred thirty-one billion, six hundred fifty-seven million, nine hundred ninety-seven thousand, two hundred eighty-four".