78320158 has 16 divisors (see below), whose sum is σ = 134645760. Its totient is φ = 33470136.

The previous prime is 78320149. The next prime is 78320159. The reversal of 78320158 is 85102387.

It is a super-2 number, since 2×78320158² = 12268094298289928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78320159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2766 + ... + 12817.

It is an arithmetic number, because the mean of its divisors is an integer number (8415360).

Almost surely, 2^78320158 is an apocalyptic number.

78320158 is a deficient number, since it is larger than the sum of its proper divisors (56325602).

78320158 is a wasteful number, since it uses less digits than its factorization.

78320158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15951.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 78320158 is about 8849.8676826267. The cubic root of 78320158 is about 427.8496538634.

The spelling of 78320158 in words is "seventy-eight million, three hundred twenty thousand, one hundred fifty-eight".