79960861 has 4 divisors (see below), whose sum is σ = 80002300. Its totient is φ = 79919424.

The previous prime is 79960849. The next prime is 79960889. The reversal of 79960861 is 16806997.

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 66928761 + 13032100 = 8181^2 + 3610^2 .

It is a cyclic number.

It is not a de Polignac number, because 79960861 - 2⁷ = 79960733 is a prime.

It is a super-2 number, since 2×79960861² = 12787478583722642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79960831) 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, 17676 + ... + 21733.

It is an arithmetic number, because the mean of its divisors is an integer number (20000575).

Almost surely, 2^79960861 is an apocalyptic number.

It is an amenable number.

79960861 is a deficient number, since it is larger than the sum of its proper divisors (41439).

79960861 is a wasteful number, since it uses less digits than its factorization.

79960861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41438.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 79960861 is about 8942.0837057142. The cubic root of 79960861 is about 430.8166578611.

The spelling of 79960861 in words is "seventy-nine million, nine hundred sixty thousand, eight hundred sixty-one".