3645721730 has 32 divisors (see below), whose sum is σ = 7622726400. Its totient is φ = 1229469120.

The previous prime is 3645721721. The next prime is 3645721741. The reversal of 3645721730 is 371275463.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422630 + ... + 431169.

It is an arithmetic number, because the mean of its divisors is an integer number (238210200).

Almost surely, 2^3645721730 is an apocalyptic number.

3645721730 is an abundant number, since it is smaller than the sum of its proper divisors (3977004670).

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

3645721730 is a wasteful number, since it uses less digits than its factorization.

3645721730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853874.

The product of its (nonzero) digits is 105840, while the sum is 38.

The square root of 3645721730 is about 60379.8122719838. The cubic root of 3645721730 is about 1539.0799206916.

The spelling of 3645721730 in words is "three billion, six hundred forty-five million, seven hundred twenty-one thousand, seven hundred thirty".