3644680320 has 512 divisors, whose sum is σ = 14408928000. Its totient is φ = 865271808.

The previous prime is 3644680289. The next prime is 3644680321. The reversal of 3644680320 is 230864463.

It is a happy number.

3644680320 is a `hidden beast` number, since 3 + 644 + 6 + 8 + 0 + 3 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (3644680321) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5581114 + ... + 5581766.

Almost surely, 2^3644680320 is an apocalyptic number.

3644680320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3644680320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7204464000).

3644680320 is an abundant number, since it is smaller than the sum of its proper divisors (10764247680).

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

3644680320 is a wasteful number, since it uses less digits than its factorization.

3644680320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717 (or 699 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 3644680320 is about 60371.1878299574. The cubic root of 3644680320 is about 1538.9333593265.

The spelling of 3644680320 in words is "three billion, six hundred forty-four million, six hundred eighty thousand, three hundred twenty".