18636828 has 96 divisors (see below), whose sum is σ = 54448128. Its totient is φ = 4838400.

The previous prime is 18636817. The next prime is 18636829. The reversal of 18636828 is 82863681.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 18636828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18636829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44058 + ... + 44478.

It is an arithmetic number, because the mean of its divisors is an integer number (567168).

Almost surely, 2^18636828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18636828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27224064).

18636828 is an abundant number, since it is smaller than the sum of its proper divisors (35811300).

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

18636828 is a wasteful number, since it uses less digits than its factorization.

18636828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 481 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 18636828 is about 4317.0392631988. The cubic root of 18636828 is about 265.1290601918.

The spelling of 18636828 in words is "eighteen million, six hundred thirty-six thousand, eight hundred twenty-eight".