879796721 has 4 divisors (see below), whose sum is σ = 880659444. Its totient is φ = 878934000.

The previous prime is 879796663. The next prime is 879796739. The reversal of 879796721 is 127697978.

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 732514225 + 147282496 = 27065^2 + 12136^2 .

It is a cyclic number.

It is not a de Polignac number, because 879796721 - 2¹⁸ = 879534577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (879796781) 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, 429830 + ... + 431871.

It is an arithmetic number, because the mean of its divisors is an integer number (220164861).

Almost surely, 2^879796721 is an apocalyptic number.

It is an amenable number.

879796721 is a deficient number, since it is larger than the sum of its proper divisors (862723).

879796721 is a wasteful number, since it uses less digits than its factorization.

879796721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862722.

The product of its digits is 2667168, while the sum is 56.

The square root of 879796721 is about 29661.3674836478. The cubic root of 879796721 is about 958.2101782274.

The spelling of 879796721 in words is "eight hundred seventy-nine million, seven hundred ninety-six thousand, seven hundred twenty-one".