78925986 has 12 divisors (see below), whose sum is σ = 171006342. Its totient is φ = 26308656.

The previous prime is 78925963. The next prime is 78925997. The reversal of 78925986 is 68952987.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 76895361 + 2030625 = 8769^2 + 1425^2 .

It is a super-2 number, since 2×78925986² = 12458622532144392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2192371 + ... + 2192406.

Almost surely, 2^78925986 is an apocalyptic number.

78925986 is an abundant number, since it is smaller than the sum of its proper divisors (92080356).

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

78925986 is a wasteful number, since it uses less digits than its factorization.

78925986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384785 (or 4384782 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 78925986 is about 8884.0298288558. The cubic root of 78925986 is about 428.9499998779.

The spelling of 78925986 in words is "seventy-eight million, nine hundred twenty-five thousand, nine hundred eighty-six".