3665885720 has 32 divisors (see below), whose sum is σ = 9426564000. Its totient is φ = 1256875008.

The previous prime is 3665885689. The next prime is 3665885723. The reversal of 3665885720 is 275885663.

It is a super-2 number, since 2×3665885720² = 26877436224199836800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665885723) 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, 6545945 + ... + 6546504.

It is an arithmetic number, because the mean of its divisors is an integer number (294580125).

Almost surely, 2^3665885720 is an apocalyptic number.

It is an amenable number.

3665885720 is an abundant number, since it is smaller than the sum of its proper divisors (5760678280).

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

3665885720 is a wasteful number, since it uses less digits than its factorization.

3665885720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13092467 (or 13092463 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 50.

The square root of 3665885720 is about 60546.5582836878. The cubic root of 3665885720 is about 1541.9121858923.

The spelling of 3665885720 in words is "three billion, six hundred sixty-five million, eight hundred eighty-five thousand, seven hundred twenty".