78971860 has 36 divisors (see below), whose sum is σ = 182293524. Its totient is φ = 28716160.

The previous prime is 78971831. The next prime is 78971873. The reversal of 78971860 is 6817987.

It can be written as a sum of positive squares in 2 ways, for example, as 41835024 + 37136836 = 6468^2 + 6094^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78971860.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13897 + ... + 18736.

It is an arithmetic number, because the mean of its divisors is an integer number (5063709).

Almost surely, 2^78971860 is an apocalyptic number.

It is an amenable number.

78971860 is an abundant number, since it is smaller than the sum of its proper divisors (103321664).

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

78971860 is a wasteful number, since it uses less digits than its factorization.

78971860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32664 (or 32651 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 78971860 is about 8886.6112776468. The cubic root of 78971860 is about 429.0330897115.

The spelling of 78971860 in words is "seventy-eight million, nine hundred seventy-one thousand, eight hundred sixty".