78816940 has 48 divisors (see below), whose sum is σ = 175230720. Its totient is φ = 29695680.

The previous prime is 78816931. The next prime is 78816971. The reversal of 78816940 is 4961887.

It is a super-2 number, since 2×78816940² = 12424220061927200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

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 15 ways as a sum of consecutive naturals, for example, 79689 + ... + 80671.

It is an arithmetic number, because the mean of its divisors is an integer number (3650640).

Almost surely, 2^78816940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78816940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87615360).

78816940 is an abundant number, since it is smaller than the sum of its proper divisors (96413780).

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

78816940 is a wasteful number, since it uses less digits than its factorization.

78816940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 1220 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 78816940 is about 8877.8905152069. The cubic root of 78816940 is about 428.7523596897.

The spelling of 78816940 in words is "seventy-eight million, eight hundred sixteen thousand, nine hundred forty".