721764725 has 24 divisors (see below), whose sum is σ = 1018809792. Its totient is φ = 502092800.

The previous prime is 721764689. The next prime is 721764727. The reversal of 721764725 is 527467127.

It is not a de Polignac number, because 721764725 - 2¹⁰ = 721763701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721764727) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 50732 + ... + 63381.

It is an arithmetic number, because the mean of its divisors is an integer number (42450408).

Almost surely, 2^721764725 is an apocalyptic number.

It is an amenable number.

721764725 is a deficient number, since it is larger than the sum of its proper divisors (297045067).

721764725 is a wasteful number, since it uses less digits than its factorization.

721764725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114157 (or 114152 counting only the distinct ones).

The product of its digits is 164640, while the sum is 41.

The square root of 721764725 is about 26865.6793139500. The cubic root of 721764725 is about 897.0126154740.

The spelling of 721764725 in words is "seven hundred twenty-one million, seven hundred sixty-four thousand, seven hundred twenty-five".