721828818 has 48 divisors (see below), whose sum is σ = 1589712696. Its totient is φ = 236666880.

The previous prime is 721828787. The next prime is 721828837. The reversal of 721828818 is 818828127.

721828818 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 709529769 + 12299049 = 26637^2 + 3507^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 841846 + ... + 842702.

Almost surely, 2^721828818 is an apocalyptic number.

721828818 is an abundant number, since it is smaller than the sum of its proper divisors (867883878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721828818 is a wasteful number, since it uses less digits than its factorization.

721828818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579 (or 1576 counting only the distinct ones).

The product of its digits is 114688, while the sum is 45.

The square root of 721828818 is about 26866.8721290738. The cubic root of 721828818 is about 897.0391663826.

The spelling of 721828818 in words is "seven hundred twenty-one million, eight hundred twenty-eight thousand, eight hundred eighteen".