78943920 has 160 divisors (see below), whose sum is σ = 282839040. Its totient is φ = 18001920.

The previous prime is 78943913. The next prime is 78943927. The reversal of 78943920 is 2934987.

It is an interprime number because it is at equal distance from previous prime (78943913) and next prime (78943927).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78943927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44001 + ... + 45759.

It is an arithmetic number, because the mean of its divisors is an integer number (1767744).

Almost surely, 2^78943920 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 78943920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141419520).

78943920 is an abundant number, since it is smaller than the sum of its proper divisors (203895120).

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

78943920 is a wasteful number, since it uses less digits than its factorization.

78943920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803 (or 1797 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 78943920 is about 8885.0391107749. The cubic root of 78943920 is about 428.9824868829.

The spelling of 78943920 in words is "seventy-eight million, nine hundred forty-three thousand, nine hundred twenty".