78679881 has 24 divisors (see below), whose sum is σ = 130653120. Its totient is φ = 44693856.

The previous prime is 78679873. The next prime is 78679883. The reversal of 78679881 is 18897687.

It is not a de Polignac number, because 78679881 - 2³ = 78679873 is a prime.

It is a super-2 number, since 2×78679881² = 12381047348348322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78679883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7290 + ... + 14508.

It is an arithmetic number, because the mean of its divisors is an integer number (5443880).

Almost surely, 2^78679881 is an apocalyptic number.

It is an amenable number.

78679881 is a deficient number, since it is larger than the sum of its proper divisors (51973239).

78679881 is a wasteful number, since it uses less digits than its factorization.

78679881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7405 (or 7402 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 78679881 is about 8870.1680367398. The cubic root of 78679881 is about 428.5036886746.

The spelling of 78679881 in words is "seventy-eight million, six hundred seventy-nine thousand, eight hundred eighty-one".