2172604686 has 32 divisors (see below), whose sum is σ = 5035903488. Its totient is φ = 612000480.

The previous prime is 2172604663. The next prime is 2172604691. The reversal of 2172604686 is 6864062712.

It is a super-2 number, since 2×2172604686² = 9440422243258317192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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, 361305 + ... + 367268.

It is an arithmetic number, because the mean of its divisors is an integer number (157371984).

Almost surely, 2^2172604686 is an apocalyptic number.

2172604686 is an abundant number, since it is smaller than the sum of its proper divisors (2863298802).

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

2172604686 is a wasteful number, since it uses less digits than its factorization.

2172604686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728656.

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 2172604686 is about 46611.2077294721. The cubic root of 2172604686 is about 1295.1703807268.

It can be divided in two parts, 217 and 2604686, that added together give a triangular number (2604903 = T₂₂₈₂).

The spelling of 2172604686 in words is "two billion, one hundred seventy-two million, six hundred four thousand, six hundred eighty-six".