928640802721 has 2 divisors, whose sum is σ = 928640802722. Its totient is φ = 928640802720.

The previous prime is 928640802671. The next prime is 928640802767. The reversal of 928640802721 is 127208046829.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 814977423121 + 113663379600 = 902761^2 + 337140^2 .

It is a cyclic number.

It is not a de Polignac number, because 928640802721 - 2²⁹ = 928103931809 is a prime.

It is not a weakly prime, because it can be changed into another prime (928640803721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 464320401360 + 464320401361.

It is an arithmetic number, because the mean of its divisors is an integer number (464320401361).

Almost surely, 2^928640802721 is an apocalyptic number.

It is an amenable number.

928640802721 is a deficient number, since it is larger than the sum of its proper divisors (1).

928640802721 is an equidigital number, since it uses as much as digits as its factorization.

928640802721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 928640802721 in words is "nine hundred twenty-eight billion, six hundred forty million, eight hundred two thousand, seven hundred twenty-one".