78312057 has 12 divisors (see below), whose sum is σ = 106230000. Its totient is φ = 51316312.

The previous prime is 78312029. The next prime is 78312061. The reversal of 78312057 is 75021387.

It is not a de Polignac number, because 78312057 - 2⁶ = 78311993 is a prime.

It is a super-2 number, since 2×78312057² = 12265556543142498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78313057) 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, 6694 + ... + 14192.

It is an arithmetic number, because the mean of its divisors is an integer number (8852500).

Almost surely, 2^78312057 is an apocalyptic number.

It is an amenable number.

78312057 is a deficient number, since it is larger than the sum of its proper divisors (27917943).

78312057 is an equidigital number, since it uses as much as digits as its factorization.

78312057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7620 (or 7561 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 78312057 is about 8849.4099803320. The cubic root of 78312057 is about 427.8349018947.

The spelling of 78312057 in words is "seventy-eight million, three hundred twelve thousand, fifty-seven".