79319866 has 4 divisors (see below), whose sum is σ = 118979802. Its totient is φ = 39659932.

The previous prime is 79319857. The next prime is 79319881. The reversal of 79319866 is 66891397.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66891397 = 31 ⋅2157787.

It can be written as a sum of positive squares in only one way, i.e., 58844241 + 20475625 = 7671^2 + 4525^2 .

It is a super-2 number, since 2×79319866² = 12583282284515912, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19829965 + ... + 19829968.

Almost surely, 2^79319866 is an apocalyptic number.

79319866 is a deficient number, since it is larger than the sum of its proper divisors (39659936).

79319866 is a wasteful number, since it uses less digits than its factorization.

79319866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39659935.

The product of its digits is 489888, while the sum is 49.

The square root of 79319866 is about 8906.1701084136. The cubic root of 79319866 is about 429.6623742381.

The spelling of 79319866 in words is "seventy-nine million, three hundred nineteen thousand, eight hundred sixty-six".