2157208672 has 24 divisors (see below), whose sum is σ = 4250307600. Its totient is φ = 1077765504.

The previous prime is 2157208609. The next prime is 2157208699. The reversal of 2157208672 is 2768027512.

It is a happy number.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 16654 + ... + 67762.

It is an arithmetic number, because the mean of its divisors is an integer number (177096150).

Almost surely, 2^2157208672 is an apocalyptic number.

It is an amenable number.

2157208672 is a deficient number, since it is larger than the sum of its proper divisors (2093098928).

2157208672 is a wasteful number, since it uses less digits than its factorization.

2157208672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52438 (or 52430 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 2157208672 is about 46445.7605385034. The cubic root of 2157208672 is about 1292.1037467770.

The spelling of 2157208672 in words is "two billion, one hundred fifty-seven million, two hundred eight thousand, six hundred seventy-two".