3639945469860 has 192 divisors, whose sum is σ = 12947808061440. Its totient is φ = 831615984000.

The previous prime is 3639945469819. The next prime is 3639945469877. The reversal of 3639945469860 is 689645499363.

It is a happy number.

3639945469860 is a `hidden beast` number, since 3 + 6 + 3 + 99 + 454 + 6 + 9 + 86 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8294887 + ... + 8722673.

It is an arithmetic number, because the mean of its divisors is an integer number (67436500320).

Almost surely, 2^{3639945469860} is an apocalyptic number.

3639945469860 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 3639945469860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6473904030720).

3639945469860 is an abundant number, since it is smaller than the sum of its proper divisors (9307862591580).

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

3639945469860 is a wasteful number, since it uses less digits than its factorization.

3639945469860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430063 (or 430055 counting only the distinct ones).

The product of its (nonzero) digits is 906992640, while the sum is 72.

The spelling of 3639945469860 in words is "three trillion, six hundred thirty-nine billion, nine hundred forty-five million, four hundred sixty-nine thousand, eight hundred sixty".