2172871690 has 32 divisors (see below), whose sum is σ = 4413864960. Its totient is φ = 762888000.

The previous prime is 2172871639. The next prime is 2172871693. The reversal of 2172871690 is 961782712.

It is a super-2 number, since 2×2172871690² = 9442742762406912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2172871693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337386 + ... + 343765.

It is an arithmetic number, because the mean of its divisors is an integer number (137933280).

Almost surely, 2^2172871690 is an apocalyptic number.

2172871690 is an abundant number, since it is smaller than the sum of its proper divisors (2240993270).

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

2172871690 is a wasteful number, since it uses less digits than its factorization.

2172871690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681198.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 2172871690 is about 46614.0718024075. The cubic root of 2172871690 is about 1295.2234355553.

The spelling of 2172871690 in words is "two billion, one hundred seventy-two million, eight hundred seventy-one thousand, six hundred ninety".