78984920 has 32 divisors (see below), whose sum is σ = 203104800. Its totient is φ = 27080448.

The previous prime is 78984883. The next prime is 78984947. The reversal of 78984920 is 2948987.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140765 + ... + 141324.

It is an arithmetic number, because the mean of its divisors is an integer number (6347025).

Almost surely, 2^78984920 is an apocalyptic number.

78984920 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78984920 is an abundant number, since it is smaller than the sum of its proper divisors (124119880).

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

78984920 is a wasteful number, since it uses less digits than its factorization.

78984920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282107 (or 282103 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 78984920 is about 8887.3460605515. The cubic root of 78984920 is about 429.0567389089.

The spelling of 78984920 in words is "seventy-eight million, nine hundred eighty-four thousand, nine hundred twenty".