721442725 has 12 divisors (see below), whose sum is σ = 933484896. Its totient is φ = 552060080.

The previous prime is 721442707. The next prime is 721442741. The reversal of 721442725 is 527244127.

It is not a de Polignac number, because 721442725 - 2¹³ = 721434533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 626767 + ... + 627916.

It is an arithmetic number, because the mean of its divisors is an integer number (77790408).

Almost surely, 2^721442725 is an apocalyptic number.

It is an amenable number.

721442725 is a deficient number, since it is larger than the sum of its proper divisors (212042171).

721442725 is a wasteful number, since it uses less digits than its factorization.

721442725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254716 (or 1254711 counting only the distinct ones).

The product of its digits is 31360, while the sum is 34.

The square root of 721442725 is about 26859.6858693470. The cubic root of 721442725 is about 896.8792012575.

The spelling of 721442725 in words is "seven hundred twenty-one million, four hundred forty-two thousand, seven hundred twenty-five".