231116640 has 96 divisors (see below), whose sum is σ = 734632416. Its totient is φ = 61071360.

The previous prime is 231116621. The next prime is 231116663. The reversal of 231116640 is 46611132.

231116640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 231116640.

It is a congruent number.

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, 52110 + ... + 56370.

It is an arithmetic number, because the mean of its divisors is an integer number (7652421).

Almost surely, 2^231116640 is an apocalyptic number.

231116640 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 231116640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367316208).

231116640 is an abundant number, since it is smaller than the sum of its proper divisors (503515776).

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

231116640 is a wasteful number, since it uses less digits than its factorization.

231116640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4392 (or 4384 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 231116640 is about 15202.5208435970. The cubic root of 231116640 is about 613.6824991476.

Adding to 231116640 its reverse (46611132), we get a palindrome (277727772).

The spelling of 231116640 in words is "two hundred thirty-one million, one hundred sixteen thousand, six hundred forty".