3645586638 has 24 divisors (see below), whose sum is σ = 7955602200. Its totient is φ = 1206452304.

The previous prime is 3645586619. The next prime is 3645586657. The reversal of 3645586638 is 8366855463.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3645586619) and next prime (3645586657).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 726033 + ... + 731036.

It is an arithmetic number, because the mean of its divisors is an integer number (331483425).

Almost surely, 2^3645586638 is an apocalyptic number.

3645586638 is an abundant number, since it is smaller than the sum of its proper divisors (4310015562).

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

3645586638 is a wasteful number, since it uses less digits than its factorization.

3645586638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457216 (or 1457213 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 54.

The square root of 3645586638 is about 60378.6935764596. The cubic root of 3645586638 is about 1539.0609102854.

The spelling of 3645586638 in words is "three billion, six hundred forty-five million, five hundred eighty-six thousand, six hundred thirty-eight".