8215972164 has 27 divisors (see below), whose sum is σ = 20769526687. Its totient is φ = 2738476104.

The previous prime is 8215972157. The next prime is 8215972189. The reversal of 8215972164 is 4612795128.

The square root of 8215972164 is 90642.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 536299 + ... + 551405.

Almost surely, 2^8215972164 is an apocalyptic number.

8215972164 is the 90642-nd square number.

It is an amenable number.

8215972164 is an abundant number, since it is smaller than the sum of its proper divisors (12553554523).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8215972164 is an equidigital number, since it uses as much as digits as its factorization.

8215972164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30224 (or 15112 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The cubic root of 8215972164 is about 2017.8381082756.

The spelling of 8215972164 in words is "eight billion, two hundred fifteen million, nine hundred seventy-two thousand, one hundred sixty-four".