3639780646788 has 96 divisors (see below), whose sum is σ = 9979882722432. Its totient is φ = 1017885542400.

The previous prime is 3639780646783. The next prime is 3639780646837. The reversal of 3639780646788 is 8876460879363.

It is a super-2 number, since 2×3639780646788² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3639780646783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7261548 + ... + 7746588.

It is an arithmetic number, because the mean of its divisors is an integer number (103957111692).

Almost surely, 2^{3639780646788} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3639780646788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4989941361216).

3639780646788 is an abundant number, since it is smaller than the sum of its proper divisors (6340102075644).

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

3639780646788 is a wasteful number, since it uses less digits than its factorization.

3639780646788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489445 (or 489443 counting only the distinct ones).

The product of its (nonzero) digits is 1755758592, while the sum is 75.

The spelling of 3639780646788 in words is "three trillion, six hundred thirty-nine billion, seven hundred eighty million, six hundred forty-six thousand, seven hundred eighty-eight".