18764136 has 80 divisors (see below), whose sum is σ = 54885600. Its totient is φ = 5978016.

The previous prime is 18764117. The next prime is 18764167. The reversal of 18764136 is 63146781.

18764136 is a `hidden beast` number, since 1 + 8 + 7 + 641 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18764136.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14275 + ... + 15533.

It is an arithmetic number, because the mean of its divisors is an integer number (686070).

Almost surely, 2^18764136 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 18764136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27442800).

18764136 is an abundant number, since it is smaller than the sum of its proper divisors (36121464).

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

18764136 is a wasteful number, since it uses less digits than its factorization.

18764136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300 (or 1287 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 18764136 is about 4331.7589960661. The cubic root of 18764136 is about 265.7313888203.

The spelling of 18764136 in words is "eighteen million, seven hundred sixty-four thousand, one hundred thirty-six".