2161757280 has 48 divisors (see below), whose sum is σ = 6809536944. Its totient is φ = 576468480.

The previous prime is 2161757251. The next prime is 2161757309. The reversal of 2161757280 is 827571612.

It is an interprime number because it is at equal distance from previous prime (2161757251) and next prime (2161757309).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2251351 + ... + 2252310.

It is an arithmetic number, because the mean of its divisors is an integer number (141865353).

Almost surely, 2^2161757280 is an apocalyptic number.

2161757280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161757280 is an abundant number, since it is smaller than the sum of its proper divisors (4647779664).

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

2161757280 is a wasteful number, since it uses less digits than its factorization.

2161757280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4503679 (or 4503671 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 2161757280 is about 46494.7016336270. The cubic root of 2161757280 is about 1293.0112694602.

The spelling of 2161757280 in words is "two billion, one hundred sixty-one million, seven hundred fifty-seven thousand, two hundred eighty".