231439988736 has 288 divisors, whose sum is σ = 741202403760. Its totient is φ = 68979916800.

The previous prime is 231439988683. The next prime is 231439988777. The reversal of 231439988736 is 637889934132.

231439988736 is a `hidden beast` number, since 2 + 3 + 1 + 439 + 98 + 87 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×231439988736² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 12358516 + ... + 12377228.

Almost surely, 2^231439988736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231439988736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370601201880).

231439988736 is an abundant number, since it is smaller than the sum of its proper divisors (509762415024).

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

231439988736 is a wasteful number, since it uses less digits than its factorization.

231439988736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18813 (or 18790 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 63.

The spelling of 231439988736 in words is "two hundred thirty-one billion, four hundred thirty-nine million, nine hundred eighty-eight thousand, seven hundred thirty-six".