802029504721 has 27 divisors (see below), whose sum is σ = 837641109819. Its totient is φ = 767918481792.

The previous prime is 802029504719. The next prime is 802029504761. The reversal of 802029504721 is 127405920208.

The square root of 802029504721 is 895561.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 325841180625 + 476188324096 = 570825^2 + 690064^2 .

It is not a de Polignac number, because 802029504721 - 2¹ = 802029504719 is a prime.

It is a super-2 number, since 2×802029504721² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (802029504761) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2272038081 + ... + 2272038433.

Almost surely, 2^802029504721 is an apocalyptic number.

802029504721 is the 895561-st square number.

802029504721 is the 447781-st centered octagonal number.

It is an amenable number.

802029504721 is a deficient number, since it is larger than the sum of its proper divisors (35611605098).

802029504721 is an frugal number, since it uses more digits than its factorization.

802029504721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 802029504721 in words is "eight hundred two billion, twenty-nine million, five hundred four thousand, seven hundred twenty-one".