721225608 has 32 divisors (see below), whose sum is σ = 1851797760. Its totient is φ = 233910720.

The previous prime is 721225607. The next prime is 721225639. The reversal of 721225608 is 806522127.

721225608 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (721225607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405208 + ... + 406983.

It is an arithmetic number, because the mean of its divisors is an integer number (57868680).

Almost surely, 2^721225608 is an apocalyptic number.

It is an amenable number.

721225608 is an abundant number, since it is smaller than the sum of its proper divisors (1130572152).

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

721225608 is a wasteful number, since it uses less digits than its factorization.

721225608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812237 (or 812233 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 721225608 is about 26855.6438761017. The cubic root of 721225608 is about 896.7892207909.

The spelling of 721225608 in words is "seven hundred twenty-one million, two hundred twenty-five thousand, six hundred eight".