78164458 has 16 divisors (see below), whose sum is σ = 119517696. Its totient is φ = 38331360.

The previous prime is 78164447. The next prime is 78164477. The reversal of 78164458 is 85446187.

It is a super-2 number, since 2×78164458² = 12219364988867528, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26485 + ... + 29287.

It is an arithmetic number, because the mean of its divisors is an integer number (7469856).

Almost surely, 2^78164458 is an apocalyptic number.

78164458 is a deficient number, since it is larger than the sum of its proper divisors (41353238).

78164458 is a wasteful number, since it uses less digits than its factorization.

78164458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3069.

The product of its digits is 215040, while the sum is 43.

The square root of 78164458 is about 8841.0665646176. The cubic root of 78164458 is about 427.5659449357.

The spelling of 78164458 in words is "seventy-eight million, one hundred sixty-four thousand, four hundred fifty-eight".