3636399640 has 16 divisors (see below), whose sum is σ = 8181899280. Its totient is φ = 1454559840.

The previous prime is 3636399629. The next prime is 3636399643. The reversal of 3636399640 is 469936363.

It is a happy number.

3636399640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3636399643) 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, 45454956 + ... + 45455035.

It is an arithmetic number, because the mean of its divisors is an integer number (511368705).

Almost surely, 2^3636399640 is an apocalyptic number.

It is an amenable number.

3636399640 is an abundant number, since it is smaller than the sum of its proper divisors (4545499640).

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

3636399640 is a wasteful number, since it uses less digits than its factorization.

3636399640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90910002 (or 90909998 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 49.

The square root of 3636399640 is about 60302.5674411961. The cubic root of 3636399640 is about 1537.7669947674.

The spelling of 3636399640 in words is "three billion, six hundred thirty-six million, three hundred ninety-nine thousand, six hundred forty".