312780663 has 32 divisors (see below), whose sum is σ = 500364480. Its totient is φ = 191963520.

The previous prime is 312780659. The next prime is 312780697. The reversal of 312780663 is 366087213.

It is a happy number.

It is not a de Polignac number, because 312780663 - 2² = 312780659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312780463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160845 + ... + 162777.

It is an arithmetic number, because the mean of its divisors is an integer number (15636390).

Almost surely, 2^312780663 is an apocalyptic number.

312780663 is a deficient number, since it is larger than the sum of its proper divisors (187583817).

312780663 is a wasteful number, since it uses less digits than its factorization.

312780663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416 (or 2410 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 312780663 is about 17685.6060964842. The cubic root of 312780663 is about 678.8074997837.

The spelling of 312780663 in words is "three hundred twelve million, seven hundred eighty thousand, six hundred sixty-three".