78961868 has 24 divisors (see below), whose sum is σ = 140842800. Its totient is φ = 38728448.

The previous prime is 78961849. The next prime is 78961903. The reversal of 78961868 is 86816987.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47963 + ... + 49581.

It is an arithmetic number, because the mean of its divisors is an integer number (5868450).

Almost surely, 2^78961868 is an apocalyptic number.

It is an amenable number.

78961868 is a deficient number, since it is larger than the sum of its proper divisors (61880932).

78961868 is a wasteful number, since it uses less digits than its factorization.

78961868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849 (or 1847 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 53.

The square root of 78961868 is about 8886.0490658110. The cubic root of 78961868 is about 429.0149943231.

The spelling of 78961868 in words is "seventy-eight million, nine hundred sixty-one thousand, eight hundred sixty-eight".