2161634720 has 96 divisors (see below), whose sum is σ = 5994269568. Its totient is φ = 721087488.

The previous prime is 2161634707. The next prime is 2161634747. The reversal of 2161634720 is 274361612.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15359 + ... + 67521.

It is an arithmetic number, because the mean of its divisors is an integer number (62440308).

Almost surely, 2^2161634720 is an apocalyptic number.

2161634720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161634720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2997134784).

2161634720 is an abundant number, since it is smaller than the sum of its proper divisors (3832634848).

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

2161634720 is a wasteful number, since it uses less digits than its factorization.

2161634720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52222 (or 52214 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 2161634720 is about 46493.3836153060. The cubic root of 2161634720 is about 1292.9868334057.

The spelling of 2161634720 in words is "two billion, one hundred sixty-one million, six hundred thirty-four thousand, seven hundred twenty".