78609408 has 44 divisors (see below), whose sum is σ = 209530920. Its totient is φ = 26202112.

The previous prime is 78609407. The next prime is 78609409. The reversal of 78609408 is 80490687.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78609407) and next prime (78609409).

It is a super-2 number, since 2×78609408² = 12358878052220928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78609408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78609407) 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, 9723 + ... + 15866.

Almost surely, 2^78609408 is an apocalyptic number.

It is an amenable number.

78609408 is an abundant number, since it is smaller than the sum of its proper divisors (130921512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78609408 is a wasteful number, since it uses less digits than its factorization.

78609408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25612 (or 25594 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 78609408 is about 8866.1946741542. The cubic root of 78609408 is about 428.3757145742.

The spelling of 78609408 in words is "seventy-eight million, six hundred nine thousand, four hundred eight".