79977898 has 72 divisors (see below), whose sum is σ = 165227040. Its totient is φ = 28697760.

The previous prime is 79977889. The next prime is 79977971. The reversal of 79977898 is 89877997.

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 in 35 ways as a sum of consecutive naturals, for example, 181963 + ... + 182401.

It is an arithmetic number, because the mean of its divisors is an integer number (2294820).

Almost surely, 2^79977898 is an apocalyptic number.

79977898 is an abundant number, since it is smaller than the sum of its proper divisors (85249142).

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

79977898 is a wasteful number, since it uses less digits than its factorization.

79977898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 472 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 64.

The square root of 79977898 is about 8943.0362852892. The cubic root of 79977898 is about 430.8472532553.

Subtracting 79977898 from its reverse (89877997), we obtain a palindrome (9900099).

The spelling of 79977898 in words is "seventy-nine million, nine hundred seventy-seven thousand, eight hundred ninety-eight".