231608440 has 64 divisors (see below), whose sum is σ = 614799360. Its totient is φ = 76844160.

The previous prime is 231608437. The next prime is 231608473. The reversal of 231608440 is 44806132.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 231608399 and 231608408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4662 + ... + 22021.

It is an arithmetic number, because the mean of its divisors is an integer number (9606240).

Almost surely, 2^231608440 is an apocalyptic number.

231608440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231608440 is an abundant number, since it is smaller than the sum of its proper divisors (383190920).

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

231608440 is a wasteful number, since it uses less digits than its factorization.

231608440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26732 (or 26728 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 231608440 is about 15218.6871969957. The cubic root of 231608440 is about 614.1174818611.

The spelling of 231608440 in words is "two hundred thirty-one million, six hundred eight thousand, four hundred forty".