78315052 has 12 divisors (see below), whose sum is σ = 141472576. Its totient is φ = 37894320.

The previous prime is 78315037. The next prime is 78315067. The reversal of 78315052 is 25051387.

It is an interprime number because it is at equal distance from previous prime (78315037) and next prime (78315067).

It is a super-2 number, since 2×78315052² = 12266494739525408, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 315663 + ... + 315910.

Almost surely, 2^78315052 is an apocalyptic number.

It is an amenable number.

78315052 is a deficient number, since it is larger than the sum of its proper divisors (63157524).

78315052 is a wasteful number, since it uses less digits than its factorization.

78315052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631608 (or 631606 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 78315052 is about 8849.5791990354. The cubic root of 78315052 is about 427.8403559258.

The spelling of 78315052 in words is "seventy-eight million, three hundred fifteen thousand, fifty-two".