2157254672 has 20 divisors (see below), whose sum is σ = 4181724540. Its totient is φ = 1078099968.

The previous prime is 2157254669. The next prime is 2157254689. The reversal of 2157254672 is 2764527512.

It can be written as a sum of positive squares in 2 ways, for example, as 5779216 + 2151475456 = 2404^2 + 46384^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1904 + ... + 65712.

It is an arithmetic number, because the mean of its divisors is an integer number (209086227).

Almost surely, 2^2157254672 is an apocalyptic number.

It is an amenable number.

2157254672 is a deficient number, since it is larger than the sum of its proper divisors (2024469868).

2157254672 is a wasteful number, since it uses less digits than its factorization.

2157254672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65930 (or 65924 counting only the distinct ones).

The product of its digits is 235200, while the sum is 41.

The square root of 2157254672 is about 46446.2557371420. The cubic root of 2157254672 is about 1292.1129309217.

The spelling of 2157254672 in words is "two billion, one hundred fifty-seven million, two hundred fifty-four thousand, six hundred seventy-two".