3644007220 has 48 divisors (see below), whose sum is σ = 9027744768. Its totient is φ = 1209070080.

The previous prime is 3644007187. The next prime is 3644007223. The reversal of 3644007220 is 227004463.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3644007223) 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, 415477 + ... + 424156.

It is an arithmetic number, because the mean of its divisors is an integer number (188078016).

Almost surely, 2^3644007220 is an apocalyptic number.

It is an amenable number.

3644007220 is an abundant number, since it is smaller than the sum of its proper divisors (5383737548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3644007220 is a wasteful number, since it uses less digits than its factorization.

3644007220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839680 (or 839678 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 3644007220 is about 60365.6128934346. The cubic root of 3644007220 is about 1538.8386166946.

The spelling of 3644007220 in words is "three billion, six hundred forty-four million, seven thousand, two hundred twenty".