231200660 has 24 divisors (see below), whose sum is σ = 488335176. Its totient is φ = 91944320.

The previous prime is 231200653. The next prime is 231200677. The reversal of 231200660 is 66002132.

It can be written as a sum of positive squares in 4 ways, for example, as 28536964 + 202663696 = 5342^2 + 14236^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29951 + ... + 36870.

It is an arithmetic number, because the mean of its divisors is an integer number (20347299).

Almost surely, 2^231200660 is an apocalyptic number.

231200660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231200660 is an abundant number, since it is smaller than the sum of its proper divisors (257134516).

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

231200660 is a wasteful number, since it uses less digits than its factorization.

231200660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67003 (or 67001 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 231200660 is about 15205.2839499958. The cubic root of 231200660 is about 613.7568560561.

Adding to 231200660 its reverse (66002132), we get a palindrome (297202792).

The spelling of 231200660 in words is "two hundred thirty-one million, two hundred thousand, six hundred sixty".