8251720272 has 60 divisors (see below), whose sum is σ = 23409733204. Its totient is φ = 2712890880.

The previous prime is 8251720259. The next prime is 8251720297. The reversal of 8251720272 is 2720271528.

It can be written as a sum of positive squares in 2 ways, for example, as 4203706896 + 4048013376 = 64836^2 + 63624^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 381979 + ... + 403002.

Almost surely, 2^8251720272 is an apocalyptic number.

It is an amenable number.

8251720272 is an abundant number, since it is smaller than the sum of its proper divisors (15158012932).

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

8251720272 is a wasteful number, since it uses less digits than its factorization.

8251720272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785068 (or 785059 counting only the distinct ones).

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

The square root of 8251720272 is about 90838.9799150123. The cubic root of 8251720272 is about 2020.7604456424.

The spelling of 8251720272 in words is "eight billion, two hundred fifty-one million, seven hundred twenty thousand, two hundred seventy-two".