2161207888 has 40 divisors (see below), whose sum is σ = 4914879872. Its totient is φ = 901196928.

The previous prime is 2161207849. The next prime is 2161207897. The reversal of 2161207888 is 8887021612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256620 + ... + 264907.

Almost surely, 2^2161207888 is an apocalyptic number.

2161207888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2161207888 is an abundant number, since it is smaller than the sum of its proper divisors (2753671984).

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

2161207888 is a wasteful number, since it uses less digits than its factorization.

2161207888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521579 (or 521573 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 2161207888 is about 46488.7931441546. The cubic root of 2161207888 is about 1292.9017242859.

The spelling of 2161207888 in words is "two billion, one hundred sixty-one million, two hundred seven thousand, eight hundred eighty-eight".