231751879920 has 480 divisors, whose sum is σ = 887329707264. Its totient is φ = 55746662400.

The previous prime is 231751879913. The next prime is 231751879921. The reversal of 231751879920 is 29978157132.

It is a happy number.

231751879920 is a `hidden beast` number, since 2 + 3 + 17 + 518 + 7 + 99 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231751879921) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 28008904 + ... + 28017176.

Almost surely, 2^231751879920 is an apocalyptic number.

231751879920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231751879920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (443664853632).

231751879920 is an abundant number, since it is smaller than the sum of its proper divisors (655577827344).

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

231751879920 is a wasteful number, since it uses less digits than its factorization.

231751879920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8443 (or 8425 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 231751879920 in words is "two hundred thirty-one billion, seven hundred fifty-one million, eight hundred seventy-nine thousand, nine hundred twenty".