721330225 has 72 divisors (see below), whose sum is σ = 1145016000. Its totient is φ = 445737600.

The previous prime is 721330223. The next prime is 721330229. The reversal of 721330225 is 522033127.

721330225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 721330225 - 2¹ = 721330223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 721330225.

It is not an unprimeable number, because it can be changed into a prime (721330223) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2681391 + ... + 2681659.

It is an arithmetic number, because the mean of its divisors is an integer number (15903000).

Almost surely, 2^721330225 is an apocalyptic number.

It is an amenable number.

721330225 is a deficient number, since it is larger than the sum of its proper divisors (423685775).

721330225 is a wasteful number, since it uses less digits than its factorization.

721330225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 721330225 is about 26857.5915710996. The cubic root of 721330225 is about 896.8325797902.

The spelling of 721330225 in words is "seven hundred twenty-one million, three hundred thirty thousand, two hundred twenty-five".