872779 has 4 divisors (see below), whose sum is σ = 874720. Its totient is φ = 870840.

The previous prime is 872761. The next prime is 872789. The reversal of 872779 is 977278.

872779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977278 = 2 ⋅488639.

It is a cyclic number.

It is not a de Polignac number, because 872779 - 2⁵ = 872747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (872749) 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, 94 + ... + 1324.

It is an arithmetic number, because the mean of its divisors is an integer number (218680).

2⁸⁷²⁷⁷⁹ is an apocalyptic number.

872779 is a deficient number, since it is larger than the sum of its proper divisors (1941).

872779 is a wasteful number, since it uses less digits than its factorization.

872779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940.

The product of its digits is 49392, while the sum is 40.

The square root of 872779 is about 934.2264179523. The cubic root of 872779 is about 95.5655644725.

The spelling of 872779 in words is "eight hundred seventy-two thousand, seven hundred seventy-nine".