3638318720 has 64 divisors (see below), whose sum is σ = 8978480640. Its totient is φ = 1408373760.

The previous prime is 3638318713. The next prime is 3638318729. The reversal of 3638318720 is 278138363.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (3638318729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71852 + ... + 111531.

It is an arithmetic number, because the mean of its divisors is an integer number (140288760).

Almost surely, 2^3638318720 is an apocalyptic number.

It is an amenable number.

3638318720 is an abundant number, since it is smaller than the sum of its proper divisors (5340161920).

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

3638318720 is a wasteful number, since it uses less digits than its factorization.

3638318720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183433 (or 183421 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 3638318720 is about 60318.4774343650. The cubic root of 3638318720 is about 1538.0374618218.

The spelling of 3638318720 in words is "three billion, six hundred thirty-eight million, three hundred eighteen thousand, seven hundred twenty".