3639880 has 16 divisors (see below), whose sum is σ = 8189820. Its totient is φ = 1455936.

The previous prime is 3639869. The next prime is 3639913. The reversal of 3639880 is 889363.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3147076 + 492804 = 1774^2 + 702^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45459 + ... + 45538.

Almost surely, 2^3639880 is an apocalyptic number.

It is an amenable number.

3639880 is an abundant number, since it is smaller than the sum of its proper divisors (4549940).

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

3639880 is a wasteful number, since it uses less digits than its factorization.

3639880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91008 (or 91004 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 3639880 is about 1907.8469540296. The cubic root of 3639880 is about 153.8257431897.

The spelling of 3639880 in words is "three million, six hundred thirty-nine thousand, eight hundred eighty".