3638816 has 24 divisors (see below), whose sum is σ = 7586460. Its totient is φ = 1712128.

The previous prime is 3638809. The next prime is 3638827. The reversal of 3638816 is 6188363.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3254416 + 384400 = 1804^2 + 620^2 .

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, 2801 + ... + 3888.

Almost surely, 2^3638816 is an apocalyptic number.

It is an amenable number.

3638816 is an abundant number, since it is smaller than the sum of its proper divisors (3947644).

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

3638816 is a wasteful number, since it uses less digits than its factorization.

3638816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6716 (or 6708 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 3638816 is about 1907.5680852856. The cubic root of 3638816 is about 153.8107530855.

The spelling of 3638816 in words is "three million, six hundred thirty-eight thousand, eight hundred sixteen".