78636464 has 20 divisors (see below), whose sum is σ = 152500656. Its totient is φ = 39281472.

The previous prime is 78636463. The next prime is 78636469. The reversal of 78636464 is 46463687.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78636461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25637 + ... + 28539.

Almost surely, 2^78636464 is an apocalyptic number.

It is an amenable number.

78636464 is a deficient number, since it is larger than the sum of its proper divisors (73864192).

78636464 is a wasteful number, since it uses less digits than its factorization.

78636464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604 (or 4598 counting only the distinct ones).

The product of its digits is 580608, while the sum is 44.

The square root of 78636464 is about 8867.7203383959. The cubic root of 78636464 is about 428.4248554433.

The spelling of 78636464 in words is "seventy-eight million, six hundred thirty-six thousand, four hundred sixty-four".