78988780 has 24 divisors (see below), whose sum is σ = 178636752. Its totient is φ = 29164992.

The previous prime is 78988769. The next prime is 78988781. The reversal of 78988780 is 8788987.

It is not an unprimeable number, because it can be changed into a prime (78988781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151642 + ... + 152161.

It is an arithmetic number, because the mean of its divisors is an integer number (7443198).

Almost surely, 2^78988780 is an apocalyptic number.

It is an amenable number.

78988780 is an abundant number, since it is smaller than the sum of its proper divisors (99647972).

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

78988780 is a wasteful number, since it uses less digits than its factorization.

78988780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303825 (or 303823 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 55.

The square root of 78988780 is about 8887.5632205909. The cubic root of 78988780 is about 429.0637281419.

The spelling of 78988780 in words is "seventy-eight million, nine hundred eighty-eight thousand, seven hundred eighty".