2159849680 has 20 divisors (see below), whose sum is σ = 5021650692. Its totient is φ = 863939840.

The previous prime is 2159849647. The next prime is 2159849743. The reversal of 2159849680 is 869489512.

It can be written as a sum of positive squares in 2 ways, for example, as 1114491456 + 1045358224 = 33384^2 + 32332^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×2159849680² = 9329901280392204800, which contains 22 as substring.

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, 13498981 + ... + 13499140.

Almost surely, 2^2159849680 is an apocalyptic number.

2159849680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2159849680 is an abundant number, since it is smaller than the sum of its proper divisors (2861801012).

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

2159849680 is a wasteful number, since it uses less digits than its factorization.

2159849680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26998134 (or 26998128 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 52.

The square root of 2159849680 is about 46474.1829406392. The cubic root of 2159849680 is about 1292.6308267844.

The spelling of 2159849680 in words is "two billion, one hundred fifty-nine million, eight hundred forty-nine thousand, six hundred eighty".