721825365 has 16 divisors (see below), whose sum is σ = 1155369600. Its totient is φ = 384823872.

The previous prime is 721825361. The next prime is 721825367. The reversal of 721825365 is 563528127.

It is not a de Polignac number, because 721825365 - 2² = 721825361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721825361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38371 + ... + 53999.

It is an arithmetic number, because the mean of its divisors is an integer number (72210600).

Almost surely, 2^721825365 is an apocalyptic number.

It is an amenable number.

721825365 is a deficient number, since it is larger than the sum of its proper divisors (433544235).

721825365 is a wasteful number, since it uses less digits than its factorization.

721825365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18716.

The product of its digits is 100800, while the sum is 39.

The square root of 721825365 is about 26866.8078677017. The cubic root of 721825365 is about 897.0377359968.

The spelling of 721825365 in words is "seven hundred twenty-one million, eight hundred twenty-five thousand, three hundred sixty-five".