2168817690 has 128 divisors (see below), whose sum is σ = 5709876480. Its totient is φ = 524040192.

The previous prime is 2168817667. The next prime is 2168817697. The reversal of 2168817690 is 967188612.

It is a super-2 number, since 2×2168817690² = 9407540344913872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2168817697) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6928974 + ... + 6929286.

It is an arithmetic number, because the mean of its divisors is an integer number (44608410).

Almost surely, 2^2168817690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2168817690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2854938240).

2168817690 is an abundant number, since it is smaller than the sum of its proper divisors (3541058790).

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

2168817690 is a wasteful number, since it uses less digits than its factorization.

2168817690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 2168817690 is about 46570.5667777406. The cubic root of 2168817690 is about 1294.4174200605.

The spelling of 2168817690 in words is "two billion, one hundred sixty-eight million, eight hundred seventeen thousand, six hundred ninety".