721869265 has 8 divisors (see below), whose sum is σ = 932877288. Its totient is φ = 533072640.

The previous prime is 721869257. The next prime is 721869271. The reversal of 721869265 is 562968127.

721869265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4915089 + 716954176 = 2217^2 + 26776^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721869265 - 2³ = 721869257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5552776 + ... + 5552905.

It is an arithmetic number, because the mean of its divisors is an integer number (116609661).

Almost surely, 2^721869265 is an apocalyptic number.

It is an amenable number.

721869265 is a deficient number, since it is larger than the sum of its proper divisors (211008023).

721869265 is a wasteful number, since it uses less digits than its factorization.

721869265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11105699.

The product of its digits is 362880, while the sum is 46.

The square root of 721869265 is about 26867.6248485049. The cubic root of 721869265 is about 897.0559209855.

The spelling of 721869265 in words is "seven hundred twenty-one million, eight hundred sixty-nine thousand, two hundred sixty-five".