79864819 has 4 divisors (see below), whose sum is σ = 81218520. Its totient is φ = 78511120.

The previous prime is 79864817. The next prime is 79864849. The reversal of 79864819 is 91846897.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79864819 - 2¹ = 79864817 is a prime.

It is a super-2 number, since 2×79864819² = 12756778627805522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79864817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676762 + ... + 676879.

It is an arithmetic number, because the mean of its divisors is an integer number (20304630).

Almost surely, 2^79864819 is an apocalyptic number.

79864819 is a deficient number, since it is larger than the sum of its proper divisors (1353701).

79864819 is a wasteful number, since it uses less digits than its factorization.

79864819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353700.

The product of its digits is 870912, while the sum is 52.

The square root of 79864819 is about 8936.7118673481. The cubic root of 79864819 is about 430.6441023136.

The spelling of 79864819 in words is "seventy-nine million, eight hundred sixty-four thousand, eight hundred nineteen".