3656381840 has 20 divisors (see below), whose sum is σ = 8501087964. Its totient is φ = 1462552704.

The previous prime is 3656381837. The next prime is 3656381849. The reversal of 3656381840 is 481836563.

It can be written as a sum of positive squares in 2 ways, for example, as 1226680576 + 2429701264 = 35024^2 + 49292^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 3656381791 and 3656381800.

It is not an unprimeable number, because it can be changed into a prime (3656381849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22852307 + ... + 22852466.

Almost surely, 2^3656381840 is an apocalyptic number.

It is an amenable number.

3656381840 is an abundant number, since it is smaller than the sum of its proper divisors (4844706124).

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

3656381840 is a wasteful number, since it uses less digits than its factorization.

3656381840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45704786 (or 45704780 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 3656381840 is about 60468.0232850388. The cubic root of 3656381840 is about 1540.5785536319.

The spelling of 3656381840 in words is "three billion, six hundred fifty-six million, three hundred eighty-one thousand, eight hundred forty".