78906980 has 12 divisors (see below), whose sum is σ = 165704700. Its totient is φ = 31562784.

The previous prime is 78906929. The next prime is 78907007. The reversal of 78906980 is 8960987.

It can be written as a sum of positive squares in 2 ways, for example, as 9784384 + 69122596 = 3128^2 + 8314^2 .

It is a super-2 number, since 2×78906980² = 12452622985440800, which contains 22 as substring.

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, 1972655 + ... + 1972694.

It is an arithmetic number, because the mean of its divisors is an integer number (13808725).

Almost surely, 2^78906980 is an apocalyptic number.

It is an amenable number.

78906980 is an abundant number, since it is smaller than the sum of its proper divisors (86797720).

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

78906980 is a wasteful number, since it uses less digits than its factorization.

78906980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3945358 (or 3945356 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 78906980 is about 8882.9600922215. The cubic root of 78906980 is about 428.9155655993.

The spelling of 78906980 in words is "seventy-eight million, nine hundred six thousand, nine hundred eighty".