231772735920 has 80 divisors (see below), whose sum is σ = 783813261312. Its totient is φ = 56187329280.

The previous prime is 231772735913. The next prime is 231772735949. The reversal of 231772735920 is 29537277132.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×231772735920² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 231772735920.

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, 43893712 + ... + 43898991.

Almost surely, 2^231772735920 is an apocalyptic number.

231772735920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231772735920 is an abundant number, since it is smaller than the sum of its proper divisors (552040525392).

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

231772735920 is a wasteful number, since it uses less digits than its factorization.

231772735920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87792730 (or 87792724 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 48.

The spelling of 231772735920 in words is "two hundred thirty-one billion, seven hundred seventy-two million, seven hundred thirty-five thousand, nine hundred twenty".