78684964 has 6 divisors (see below), whose sum is σ = 137698694. Its totient is φ = 39342480.

The previous prime is 78684953. The next prime is 78684967. The reversal of 78684964 is 46948687.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 77264100 + 1420864 = 8790^2 + 1192^2 .

It is not an unprimeable number, because it can be changed into a prime (78684967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9835617 + ... + 9835624.

Almost surely, 2^78684964 is an apocalyptic number.

It is an amenable number.

78684964 is a deficient number, since it is larger than the sum of its proper divisors (59013730).

78684964 is a wasteful number, since it uses less digits than its factorization.

78684964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19671245 (or 19671243 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The square root of 78684964 is about 8870.4545543055. The cubic root of 78684964 is about 428.5129160964.

The spelling of 78684964 in words is "seventy-eight million, six hundred eighty-four thousand, nine hundred sixty-four".