3725570721 has 4 divisors (see below), whose sum is σ = 4967427632. Its totient is φ = 2483713812.

The previous prime is 3725570699. The next prime is 3725570741. The reversal of 3725570721 is 1270755273.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3725570721 - 2⁹ = 3725570209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3725570721.

It is not an unprimeable number, because it can be changed into a prime (3725570741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620928451 + ... + 620928456.

It is an arithmetic number, because the mean of its divisors is an integer number (1241856908).

Almost surely, 2^3725570721 is an apocalyptic number.

It is an amenable number.

3725570721 is a deficient number, since it is larger than the sum of its proper divisors (1241856911).

3725570721 is a wasteful number, since it uses less digits than its factorization.

3725570721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241856910.

The product of its (nonzero) digits is 102900, while the sum is 39.

The square root of 3725570721 is about 61037.4534282026. The cubic root of 3725570721 is about 1550.2352360284.

The spelling of 3725570721 in words is "three billion, seven hundred twenty-five million, five hundred seventy thousand, seven hundred twenty-one".