18081423528 has 64 divisors (see below), whose sum is σ = 51802152960. Its totient is φ = 5152026816.

The previous prime is 18081423523. The next prime is 18081423557. The reversal of 18081423528 is 82532418081.

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 18081423528.

It is not an unprimeable number, because it can be changed into a prime (18081423523) 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, 84976 + ... + 208287.

It is an arithmetic number, because the mean of its divisors is an integer number (809408640).

Almost surely, 2^18081423528 is an apocalyptic number.

It is an amenable number.

18081423528 is an abundant number, since it is smaller than the sum of its proper divisors (33720729432).

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

18081423528 is a wasteful number, since it uses less digits than its factorization.

18081423528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293646 (or 293642 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The spelling of 18081423528 in words is "eighteen billion, eighty-one million, four hundred twenty-three thousand, five hundred twenty-eight".