78398672 has 20 divisors (see below), whose sum is σ = 165706656. Its totient is φ = 35635680.

The previous prime is 78398657. The next prime is 78398681. The reversal of 78398672 is 27689387.

It is a happy number.

It is a super-2 number, since 2×78398672² = 12292703542727168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78398672.

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, 222548 + ... + 222899.

Almost surely, 2^78398672 is an apocalyptic number.

It is an amenable number.

78398672 is an abundant number, since it is smaller than the sum of its proper divisors (87307984).

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

78398672 is a wasteful number, since it uses less digits than its factorization.

78398672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445466 (or 445460 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 50.

The square root of 78398672 is about 8854.3024569980. The cubic root of 78398672 is about 427.9925756420.

The spelling of 78398672 in words is "seventy-eight million, three hundred ninety-eight thousand, six hundred seventy-two".