79876661 has 4 divisors (see below), whose sum is σ = 80132172. Its totient is φ = 79621152.

The previous prime is 79876639. The next prime is 79876669. The reversal of 79876661 is 16667897.

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

It can be written as a sum of positive squares in 2 ways, for example, as 844561 + 79032100 = 919^2 + 8890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79876661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79876669) 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, 127286 + ... + 127911.

It is an arithmetic number, because the mean of its divisors is an integer number (20033043).

Almost surely, 2^79876661 is an apocalyptic number.

It is an amenable number.

79876661 is a deficient number, since it is larger than the sum of its proper divisors (255511).

79876661 is a wasteful number, since it uses less digits than its factorization.

79876661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255510.

The product of its digits is 762048, while the sum is 50.

The square root of 79876661 is about 8937.3743907257. The cubic root of 79876661 is about 430.6653859254.

The spelling of 79876661 in words is "seventy-nine million, eight hundred seventy-six thousand, six hundred sixty-one".