18513768 has 128 divisors (see below), whose sum is σ = 58464000. Its totient is φ = 4854528.

The previous prime is 18513767. The next prime is 18513841. The reversal of 18513768 is 86731581.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18513763) 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, 106930 + ... + 107102.

It is an arithmetic number, because the mean of its divisors is an integer number (456750).

Almost surely, 2^18513768 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 18513768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29232000).

18513768 is an abundant number, since it is smaller than the sum of its proper divisors (39950232).

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

18513768 is a wasteful number, since it uses less digits than its factorization.

18513768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 198 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 18513768 is about 4302.7628333432. The cubic root of 18513768 is about 264.5442171257.

The spelling of 18513768 in words is "eighteen million, five hundred thirteen thousand, seven hundred sixty-eight".