3561640236 has 72 divisors (see below), whose sum is σ = 11224571904. Its totient is φ = 925100640.

The previous prime is 3561640211. The next prime is 3561640241. The reversal of 3561640236 is 6320461653.

3561640236 is a `hidden beast` number, since 3 + 5 + 6 + 1 + 640 + 2 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 3561640236.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 639660 + ... + 645203.

It is an arithmetic number, because the mean of its divisors is an integer number (155896832).

Almost surely, 2^3561640236 is an apocalyptic number.

3561640236 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3561640236 is an abundant number, since it is smaller than the sum of its proper divisors (7662931668).

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

3561640236 is a wasteful number, since it uses less digits than its factorization.

3561640236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284891 (or 1284886 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 3561640236 is about 59679.4791867355. The cubic root of 3561640236 is about 1527.1558131012.

The spelling of 3561640236 in words is "three billion, five hundred sixty-one million, six hundred forty thousand, two hundred thirty-six".