312783978 has 32 divisors (see below), whose sum is σ = 689363136. Its totient is φ = 94002048.

The previous prime is 312783959. The next prime is 312783983. The reversal of 312783978 is 879387213.

312783978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43275 + ... + 49982.

It is an arithmetic number, because the mean of its divisors is an integer number (21542598).

Almost surely, 2^312783978 is an apocalyptic number.

312783978 is an abundant number, since it is smaller than the sum of its proper divisors (376579158).

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

312783978 is a wasteful number, since it uses less digits than its factorization.

312783978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93318.

The product of its digits is 508032, while the sum is 48.

The square root of 312783978 is about 17685.6998165184. The cubic root of 312783978 is about 678.8098978848.

The spelling of 312783978 in words is "three hundred twelve million, seven hundred eighty-three thousand, nine hundred seventy-eight".