2170522728 has 48 divisors (see below), whose sum is σ = 6412910400. Its totient is φ = 657733920.

The previous prime is 2170522681. The next prime is 2170522733. The reversal of 2170522728 is 8272250712.

It is a super-2 number, since 2×2170522728² = 9422337825529123968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2170522692 and 2170522701.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1369488 + ... + 1371071.

It is an arithmetic number, because the mean of its divisors is an integer number (133602300).

Almost surely, 2^2170522728 is an apocalyptic number.

It is an amenable number.

2170522728 is an abundant number, since it is smaller than the sum of its proper divisors (4242387672).

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

2170522728 is a wasteful number, since it uses less digits than its factorization.

2170522728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740582 (or 2740575 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 2170522728 is about 46588.8691427470. The cubic root of 2170522728 is about 1294.7565376655.

The spelling of 2170522728 in words is "two billion, one hundred seventy million, five hundred twenty-two thousand, seven hundred twenty-eight".