78229928 has 16 divisors (see below), whose sum is σ = 167635680. Its totient is φ = 33527088.

The previous prime is 78229913. The next prime is 78229933. The reversal of 78229928 is 82992287.

It is a super-2 number, since 2×78229928² = 12239843269770368, which contains 22 as substring.

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, 698426 + ... + 698537.

It is an arithmetic number, because the mean of its divisors is an integer number (10477230).

Almost surely, 2^78229928 is an apocalyptic number.

It is an amenable number.

78229928 is an abundant number, since it is smaller than the sum of its proper divisors (89405752).

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

78229928 is a wasteful number, since it uses less digits than its factorization.

78229928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396976 (or 1396972 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 78229928 is about 8844.7683971939. The cubic root of 78229928 is about 427.6852870308.

The spelling of 78229928 in words is "seventy-eight million, two hundred twenty-nine thousand, nine hundred twenty-eight".