4521636 has 48 divisors (see below), whose sum is σ = 13399680. Its totient is φ = 1291680.

The previous prime is 4521631. The next prime is 4521637. The reversal of 4521636 is 6361254.

4521636 is a `hidden beast` number, since 4 + 5 + 21 + 636 = 666.

4521636 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (4521631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2235 + ... + 3746.

It is an arithmetic number, because the mean of its divisors is an integer number (279160).

Almost surely, 2^4521636 is an apocalyptic number.

It is an amenable number.

4521636 is an abundant number, since it is smaller than the sum of its proper divisors (8878044).

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

4521636 is a wasteful number, since it uses less digits than its factorization.

4521636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6001 (or 5993 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 4521636 is about 2126.4138825732. The cubic root of 4521636 is about 165.3605339540.

The spelling of 4521636 in words is "four million, five hundred twenty-one thousand, six hundred thirty-six".