2157805264 has 20 divisors (see below), whose sum is σ = 4183505056. Its totient is φ = 1078191072.

The previous prime is 2157805261. The next prime is 2157805301. The reversal of 2157805264 is 4625087512.

It is a super-2 number, since 2×2157805264² = 9312247114692219392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157805261) 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, 19014 + ... + 68389.

Almost surely, 2^2157805264 is an apocalyptic number.

It is an amenable number.

2157805264 is a deficient number, since it is larger than the sum of its proper divisors (2025699792).

2157805264 is a wasteful number, since it uses less digits than its factorization.

2157805264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88954 (or 88948 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 2157805264 is about 46452.1825536756. The cubic root of 2157805264 is about 1292.2228494114. Note that the first 3 decimals are identical.

The spelling of 2157805264 in words is "two billion, one hundred fifty-seven million, eight hundred five thousand, two hundred sixty-four".