2172638679 has 16 divisors (see below), whose sum is σ = 2911825152. Its totient is φ = 1440954368.

The previous prime is 2172638621. The next prime is 2172638701. The reversal of 2172638679 is 9768362712.

It is a cyclic number.

It is not a de Polignac number, because 2172638679 - 2⁸ = 2172638423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172638609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 895462 + ... + 897884.

It is an arithmetic number, because the mean of its divisors is an integer number (181989072).

Almost surely, 2^2172638679 is an apocalyptic number.

2172638679 is a deficient number, since it is larger than the sum of its proper divisors (739186473).

2172638679 is a wasteful number, since it uses less digits than its factorization.

2172638679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3846.

The product of its digits is 1524096, while the sum is 51.

The square root of 2172638679 is about 46611.5723721052. The cubic root of 2172638679 is about 1295.1771355217.

The spelling of 2172638679 in words is "two billion, one hundred seventy-two million, six hundred thirty-eight thousand, six hundred seventy-nine".