78117158 has 16 divisors (see below), whose sum is σ = 134102304. Its totient is φ = 33432000.

The previous prime is 78117133. The next prime is 78117163. The reversal of 78117158 is 85171187.

It is a super-2 number, since 2×78117158² = 12204580747993928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7658 + ... + 14658.

It is an arithmetic number, because the mean of its divisors is an integer number (8381394).

Almost surely, 2^78117158 is an apocalyptic number.

78117158 is a deficient number, since it is larger than the sum of its proper divisors (55985146).

78117158 is a wasteful number, since it uses less digits than its factorization.

78117158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7807.

The product of its digits is 15680, while the sum is 38.

The square root of 78117158 is about 8838.3911431889. The cubic root of 78117158 is about 427.4796825838.

The spelling of 78117158 in words is "seventy-eight million, one hundred seventeen thousand, one hundred fifty-eight".