79977806 has 4 divisors (see below), whose sum is σ = 119966712. Its totient is φ = 39988902.

The previous prime is 79977773. The next prime is 79977817. The reversal of 79977806 is 60877997.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19994450 + ... + 19994453.

It is an arithmetic number, because the mean of its divisors is an integer number (29991678).

Almost surely, 2^79977806 is an apocalyptic number.

79977806 is a deficient number, since it is larger than the sum of its proper divisors (39988906).

79977806 is a wasteful number, since it uses less digits than its factorization.

79977806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39988905.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The square root of 79977806 is about 8943.0311416208. The cubic root of 79977806 is about 430.8470880514.

The spelling of 79977806 in words is "seventy-nine million, nine hundred seventy-seven thousand, eight hundred six".