78164457 has 12 divisors (see below), whose sum is σ = 121234896. Its totient is φ = 44665320.

The previous prime is 78164447. The next prime is 78164477. The reversal of 78164457 is 75446187.

It is not a de Polignac number, because 78164457 - 2⁶ = 78164393 is a prime.

It is a super-2 number, since 2×78164457² = 12219364676209698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78164447) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 265719 + ... + 266012.

It is an arithmetic number, because the mean of its divisors is an integer number (10102908).

Almost surely, 2^78164457 is an apocalyptic number.

It is an amenable number.

78164457 is a deficient number, since it is larger than the sum of its proper divisors (43070439).

78164457 is a wasteful number, since it uses less digits than its factorization.

78164457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531748 (or 531741 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 78164457 is about 8841.0665080634. The cubic root of 78164457 is about 427.5659431123.

The spelling of 78164457 in words is "seventy-eight million, one hundred sixty-four thousand, four hundred fifty-seven".