312012660 has 24 divisors (see below), whose sum is σ = 873635616. Its totient is φ = 83203360.

The previous prime is 312012587. The next prime is 312012677. The reversal of 312012660 is 66210213.

It is a happy number.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2600046 + ... + 2600165.

It is an arithmetic number, because the mean of its divisors is an integer number (36401484).

Almost surely, 2^312012660 is an apocalyptic number.

312012660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

312012660 is an abundant number, since it is smaller than the sum of its proper divisors (561622956).

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

312012660 is a wasteful number, since it uses less digits than its factorization.

312012660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5200223 (or 5200221 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 312012660 is about 17663.8800947017. The cubic root of 312012660 is about 678.2514621405.

Adding to 312012660 its reverse (66210213), we get a palindrome (378222873).

The spelling of 312012660 in words is "three hundred twelve million, twelve thousand, six hundred sixty".