2117898180 has 72 divisors (see below), whose sum is σ = 6428042712. Its totient is φ = 564443136.

The previous prime is 2117898151. The next prime is 2117898203. The reversal of 2117898180 is 818987112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 212051844 + 1905846336 = 14562^2 + 43656^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 583732 + ... + 587348.

It is an arithmetic number, because the mean of its divisors is an integer number (89278371).

Almost surely, 2^2117898180 is an apocalyptic number.

2117898180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2117898180 is an abundant number, since it is smaller than the sum of its proper divisors (4310144532).

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

2117898180 is a wasteful number, since it uses less digits than its factorization.

2117898180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6885 (or 6880 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The square root of 2117898180 is about 46020.6277662528. The cubic root of 2117898180 is about 1284.2069788908.

The spelling of 2117898180 in words is "two billion, one hundred seventeen million, eight hundred ninety-eight thousand, one hundred eighty".