78997684 has 18 divisors (see below), whose sum is σ = 140759654. Its totient is φ = 38783040.

The previous prime is 78997669. The next prime is 78997697. The reversal of 78997684 is 48679987.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 5895184 + 73102500 = 2428^2 + 8550^2 .

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 138552 + ... + 139120.

Almost surely, 2^78997684 is an apocalyptic number.

It is an amenable number.

78997684 is a deficient number, since it is larger than the sum of its proper divisors (61761970).

78997684 is an equidigital number, since it uses as much as digits as its factorization.

78997684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203 (or 632 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 58.

The square root of 78997684 is about 8888.0641311818. The cubic root of 78997684 is about 429.0798495872.

The spelling of 78997684 in words is "seventy-eight million, nine hundred ninety-seven thousand, six hundred eighty-four".