78638672 has 20 divisors (see below), whose sum is σ = 174128736. Its totient is φ = 33702240.

The previous prime is 78638669. The next prime is 78638689. The reversal of 78638672 is 27683687.

It is a congruent number.

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, 350954 + ... + 351177.

Almost surely, 2^78638672 is an apocalyptic number.

It is an amenable number.

78638672 is an abundant number, since it is smaller than the sum of its proper divisors (95490064).

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

78638672 is a wasteful number, since it uses less digits than its factorization.

78638672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702146 (or 702140 counting only the distinct ones).

The product of its digits is 677376, while the sum is 47.

The square root of 78638672 is about 8867.8448340056. The cubic root of 78638672 is about 428.4288652591.

The spelling of 78638672 in words is "seventy-eight million, six hundred thirty-eight thousand, six hundred seventy-two".