3644436402 has 20 divisors (see below), whose sum is σ = 8166237486. Its totient is φ = 1214812080.

The previous prime is 3644436401. The next prime is 3644436427. The reversal of 3644436402 is 2046344463.

3644436402 is a `hidden beast` number, since 3 + 6 + 4 + 4 + 4 + 3 + 640 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2669685561 + 974750841 = 51669^2 + 31221^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (3644436401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 11248099 + ... + 11248422.

Almost surely, 2^3644436402 is an apocalyptic number.

3644436402 is an abundant number, since it is smaller than the sum of its proper divisors (4521801084).

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

3644436402 is a wasteful number, since it uses less digits than its factorization.

3644436402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22496535 (or 22496526 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 36.

The square root of 3644436402 is about 60369.1676437567. The cubic root of 3644436402 is about 1538.8990278362.

The spelling of 3644436402 in words is "three billion, six hundred forty-four million, four hundred thirty-six thousand, four hundred two".