3639907638 has 32 divisors (see below), whose sum is σ = 8564490720. Its totient is φ = 1141931520.

The previous prime is 3639907633. The next prime is 3639907643. The reversal of 3639907638 is 8367099363.

It is an interprime number because it is at equal distance from previous prime (3639907633) and next prime (3639907643).

It is a super-3 number, since 3×3639907638³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639907631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1981603 + ... + 1983438.

It is an arithmetic number, because the mean of its divisors is an integer number (267640335).

Almost surely, 2^3639907638 is an apocalyptic number.

3639907638 is an abundant number, since it is smaller than the sum of its proper divisors (4924583082).

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

3639907638 is a wasteful number, since it uses less digits than its factorization.

3639907638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3965069 (or 3965063 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 54.

The square root of 3639907638 is about 60331.6470685162. The cubic root of 3639907638 is about 1538.2613252717.

The spelling of 3639907638 in words is "three billion, six hundred thirty-nine million, nine hundred seven thousand, six hundred thirty-eight".