78997872 has 40 divisors (see below), whose sum is σ = 204954640. Its totient is φ = 26219520.

The previous prime is 78997871. The next prime is 78997883. The reversal of 78997872 is 27879987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78997871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8154 + ... + 14982.

It is an arithmetic number, because the mean of its divisors is an integer number (5123866).

Almost surely, 2^78997872 is an apocalyptic number.

It is an amenable number.

78997872 is an abundant number, since it is smaller than the sum of its proper divisors (125956768).

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

78997872 is a wasteful number, since it uses less digits than its factorization.

78997872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7081 (or 7075 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 57.

The square root of 78997872 is about 8888.0747071568. The cubic root of 78997872 is about 429.0801899640.

The spelling of 78997872 in words is "seventy-eight million, nine hundred ninety-seven thousand, eight hundred seventy-two".