78816942 has 64 divisors (see below), whose sum is σ = 182476800. Its totient is φ = 25189920.

The previous prime is 78816931. The next prime is 78816971. The reversal of 78816942 is 24961887.

It is a super-2 number, since 2×78816942² = 12424220692462728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 329659 + ... + 329897.

It is an arithmetic number, because the mean of its divisors is an integer number (2851200).

Almost surely, 2^78816942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78816942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91238400).

78816942 is an abundant number, since it is smaller than the sum of its proper divisors (103659858).

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

78816942 is a wasteful number, since it uses less digits than its factorization.

78816942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 472 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 78816942 is about 8877.8906278462. The cubic root of 78816942 is about 428.7523633163.

The spelling of 78816942 in words is "seventy-eight million, eight hundred sixteen thousand, nine hundred forty-two".