78840816 has 20 divisors (see below), whose sum is σ = 203672232. Its totient is φ = 26280256.

The previous prime is 78840809. The next prime is 78840833. The reversal of 78840816 is 61804887.

It is a congruent number.

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, 821211 + ... + 821306.

Almost surely, 2^78840816 is an apocalyptic number.

It is an amenable number.

78840816 is an abundant number, since it is smaller than the sum of its proper divisors (124831416).

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

78840816 is a wasteful number, since it uses less digits than its factorization.

78840816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642528 (or 1642522 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 78840816 is about 8879.2351021921. The cubic root of 78840816 is about 428.7956492746.

The spelling of 78840816 in words is "seventy-eight million, eight hundred forty thousand, eight hundred sixteen".