78680772 has 18 divisors (see below), whose sum is σ = 198887598. Its totient is φ = 26226912.

The previous prime is 78680737. The next prime is 78680783. The reversal of 78680772 is 27708687.

It can be written as a sum of positive squares in only one way, i.e., 51494976 + 27185796 = 7176^2 + 5214^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1092753 + ... + 1092824.

It is an arithmetic number, because the mean of its divisors is an integer number (11049311).

Almost surely, 2^78680772 is an apocalyptic number.

It is an amenable number.

78680772 is an abundant number, since it is smaller than the sum of its proper divisors (120206826).

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

78680772 is a wasteful number, since it uses less digits than its factorization.

78680772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185587 (or 2185582 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 78680772 is about 8870.2182611253. The cubic root of 78680772 is about 428.5053061797.

The spelling of 78680772 in words is "seventy-eight million, six hundred eighty thousand, seven hundred seventy-two".