721823089 has 8 divisors (see below), whose sum is σ = 779580200. Its totient is φ = 664384896.

The previous prime is 721823087. The next prime is 721823107. The reversal of 721823089 is 980328127.

It can be written as a sum of positive squares in 4 ways, for example, as 94864 + 721728225 = 308^2 + 26865^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 721823089 - 2¹ = 721823087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721823087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75012 + ... + 84085.

It is an arithmetic number, because the mean of its divisors is an integer number (97447525).

Almost surely, 2^721823089 is an apocalyptic number.

It is an amenable number.

721823089 is a deficient number, since it is larger than the sum of its proper divisors (57757111).

721823089 is a wasteful number, since it uses less digits than its factorization.

721823089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159459.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 721823089 is about 26866.7655105709. The cubic root of 721823089 is about 897.0367931741.

The spelling of 721823089 in words is "seven hundred twenty-one million, eight hundred twenty-three thousand, eighty-nine".