78911994 has 64 divisors (see below), whose sum is σ = 193536000. Its totient is φ = 20936448.

The previous prime is 78911993. The next prime is 78911999. The reversal of 78911994 is 49911987.

It is not an unprimeable number, because it can be changed into a prime (78911993) 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, 55707 + ... + 57105.

It is an arithmetic number, because the mean of its divisors is an integer number (3024000).

Almost surely, 2^78911994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78911994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96768000).

78911994 is an abundant number, since it is smaller than the sum of its proper divisors (114624006).

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

78911994 is a wasteful number, since it uses less digits than its factorization.

78911994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507.

The product of its digits is 163296, while the sum is 48.

The square root of 78911994 is about 8883.2423134799. The cubic root of 78911994 is about 428.9246502924.

The spelling of 78911994 in words is "seventy-eight million, nine hundred eleven thousand, nine hundred ninety-four".