78164456 has 8 divisors (see below), whose sum is σ = 146558370. Its totient is φ = 39082224.

The previous prime is 78164447. The next prime is 78164477. The reversal of 78164456 is 65446187.

It can be written as a sum of positive squares in only one way, i.e., 65448100 + 12716356 = 8090^2 + 3566^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78164456² = 12219364363551872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4885271 + ... + 4885286.

Almost surely, 2^78164456 is an apocalyptic number.

It is an amenable number.

78164456 is a deficient number, since it is larger than the sum of its proper divisors (68393914).

78164456 is a wasteful number, since it uses less digits than its factorization.

78164456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9770563 (or 9770559 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 78164456 is about 8841.0664515091. The cubic root of 78164456 is about 427.5659412890.

The spelling of 78164456 in words is "seventy-eight million, one hundred sixty-four thousand, four hundred fifty-six".