3649972225 has 27 divisors (see below), whose sum is σ = 4650216969. Its totient is φ = 2841921600.

The previous prime is 3649972223. The next prime is 3649972229. The reversal of 3649972225 is 5222799463.

The square root of 3649972225 is 60415.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 5193841 + 3644778384 = 2279^2 + 60372^2 .

It is not a de Polignac number, because 3649972225 - 2¹ = 3649972223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3649972223) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12989085 + ... + 12989365.

Almost surely, 2^3649972225 is an apocalyptic number.

3649972225 is the 60415-th square number.

3649972225 is the 30208-th centered octagonal number.

It is an amenable number.

3649972225 is a deficient number, since it is larger than the sum of its proper divisors (1000244744).

3649972225 is an frugal number, since it uses more digits than its factorization.

3649972225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 329 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 49.

The cubic root of 3649972225 is about 1539.6778188388.

Multiplying 3649972225 by its sum of digits (49), we get a square (178848639025 = 422905²).

The spelling of 3649972225 in words is "three billion, six hundred forty-nine million, nine hundred seventy-two thousand, two hundred twenty-five".