721064330 has 16 divisors (see below), whose sum is σ = 1483332480. Its totient is φ = 247222032.

The previous prime is 721064317. The next prime is 721064359. The reversal of 721064330 is 33460127.

721064330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 721064330.

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, 5150390 + ... + 5150529.

It is an arithmetic number, because the mean of its divisors is an integer number (92708280).

Almost surely, 2^721064330 is an apocalyptic number.

721064330 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

721064330 is an abundant number, since it is smaller than the sum of its proper divisors (762268150).

721064330 is a wasteful number, since it uses less digits than its factorization.

721064330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10300933.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 721064330 is about 26852.6410246739. The cubic root of 721064330 is about 896.7223701631.

The spelling of 721064330 in words is "seven hundred twenty-one million, sixty-four thousand, three hundred thirty".