78609028 has 12 divisors (see below), whose sum is σ = 139450780. Its totient is φ = 38765952.

The previous prime is 78608993. The next prime is 78609043. The reversal of 78609028 is 82090687.

It can be written as a sum of positive squares in 2 ways, for example, as 42224004 + 36385024 = 6498^2 + 6032^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134313 + ... + 134896.

Almost surely, 2^78609028 is an apocalyptic number.

It is an amenable number.

78609028 is a deficient number, since it is larger than the sum of its proper divisors (60841752).

78609028 is a wasteful number, since it uses less digits than its factorization.

78609028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269286 (or 269284 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 78609028 is about 8866.1732444161. The cubic root of 78609028 is about 428.3750243132.

The spelling of 78609028 in words is "seventy-eight million, six hundred nine thousand, twenty-eight".