8250328721 has 4 divisors (see below), whose sum is σ = 8255656500. Its totient is φ = 8245000944.

The previous prime is 8250328693. The next prime is 8250328729. The reversal of 8250328721 is 1278230528.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1987822225 + 6262506496 = 44585^2 + 79136^2 .

It is a cyclic number.

It is not a de Polignac number, because 8250328721 - 2¹⁰ = 8250327697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8250328729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2661566 + ... + 2664663.

It is an arithmetic number, because the mean of its divisors is an integer number (2063914125).

Almost surely, 2^8250328721 is an apocalyptic number.

It is an amenable number.

8250328721 is a deficient number, since it is larger than the sum of its proper divisors (5327779).

8250328721 is a wasteful number, since it uses less digits than its factorization.

8250328721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5327778.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 8250328721 is about 90831.3201544489. The cubic root of 8250328721 is about 2020.6468471357.

The spelling of 8250328721 in words is "eight billion, two hundred fifty million, three hundred twenty-eight thousand, seven hundred twenty-one".