721243008 has 128 divisors (see below), whose sum is σ = 2142285600. Its totient is φ = 238878720.

The previous prime is 721242971. The next prime is 721243043. The reversal of 721243008 is 800342127.

721243008 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624960 + ... + 626112.

Almost surely, 2^721243008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721243008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071142800).

721243008 is an abundant number, since it is smaller than the sum of its proper divisors (1421042592).

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

721243008 is a wasteful number, since it uses less digits than its factorization.

721243008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357 (or 1339 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 721243008 is about 26855.9678283990. The cubic root of 721243008 is about 896.7964325920.

The spelling of 721243008 in words is "seven hundred twenty-one million, two hundred forty-three thousand, eight".