312877640 has 16 divisors (see below), whose sum is σ = 703974780. Its totient is φ = 125151040.

The previous prime is 312877627. The next prime is 312877651. The reversal of 312877640 is 46778213.

It can be written as a sum of positive squares in 2 ways, for example, as 304362916 + 8514724 = 17446^2 + 2918^2 .

It is a super-2 number, since 2×312877640² = 195784835223939200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 312877594 and 312877603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3910931 + ... + 3911010.

Almost surely, 2^312877640 is an apocalyptic number.

It is an amenable number.

312877640 is an abundant number, since it is smaller than the sum of its proper divisors (391097140).

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

312877640 is a wasteful number, since it uses less digits than its factorization.

312877640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7821952 (or 7821948 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 312877640 is about 17688.3475768654. The cubic root of 312877640 is about 678.8776468234.

The spelling of 312877640 in words is "three hundred twelve million, eight hundred seventy-seven thousand, six hundred forty".