725761621 has 8 divisors (see below), whose sum is σ = 793255904. Its totient is φ = 659934000.

The previous prime is 725761607. The next prime is 725761649. The reversal of 725761621 is 126167527.

725761621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725761621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725761121) 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, 415755 + ... + 417496.

It is an arithmetic number, because the mean of its divisors is an integer number (99156988).

Almost surely, 2^725761621 is an apocalyptic number.

It is an amenable number.

725761621 is a deficient number, since it is larger than the sum of its proper divisors (67494283).

725761621 is a wasteful number, since it uses less digits than its factorization.

725761621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833331.

The product of its digits is 35280, while the sum is 37.

The square root of 725761621 is about 26939.9632702051. The cubic root of 725761621 is about 898.6653555278.

The spelling of 725761621 in words is "seven hundred twenty-five million, seven hundred sixty-one thousand, six hundred twenty-one".