312640641 has 12 divisors (see below), whose sum is σ = 468318032. Its totient is φ = 208426932.

The previous prime is 312640637. The next prime is 312640651. The reversal of 312640641 is 146046213.

312640641 is a `hidden beast` number, since 3 + 12 + 6 + 4 + 0 + 641 = 666.

It is not a de Polignac number, because 312640641 - 2² = 312640637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312640651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 643051 + ... + 643536.

Almost surely, 2^312640641 is an apocalyptic number.

It is an amenable number.

312640641 is a deficient number, since it is larger than the sum of its proper divisors (155677391).

312640641 is an equidigital number, since it uses as much as digits as its factorization.

312640641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286602 (or 1286590 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 312640641 is about 17681.6470103890. The cubic root of 312640641 is about 678.7061911226.

Adding to 312640641 its reverse (146046213), we get a palindrome (458686854).

The spelling of 312640641 in words is "three hundred twelve million, six hundred forty thousand, six hundred forty-one".