78157065 has 16 divisors (see below), whose sum is σ = 142915968. Its totient is φ = 35728896.

The previous prime is 78157049. The next prime is 78157073. The reversal of 78157065 is 56075187.

It is not a de Polignac number, because 78157065 - 2⁴ = 78157049 is a prime.

It is a super-2 number, since 2×78157065² = 12217053618828450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372072 + ... + 372281.

It is an arithmetic number, because the mean of its divisors is an integer number (8932248).

Almost surely, 2^78157065 is an apocalyptic number.

It is an amenable number.

78157065 is a deficient number, since it is larger than the sum of its proper divisors (64758903).

78157065 is a wasteful number, since it uses less digits than its factorization.

78157065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744368.

The product of its (nonzero) digits is 58800, while the sum is 39.

The square root of 78157065 is about 8840.6484490675. The cubic root of 78157065 is about 427.5524644068.

The spelling of 78157065 in words is "seventy-eight million, one hundred fifty-seven thousand, sixty-five".