18287328 has 48 divisors (see below), whose sum is σ = 48698496. Its totient is φ = 6007680.

The previous prime is 18287327. The next prime is 18287333. The reversal of 18287328 is 82378281.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18287327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5475 + ... + 8157.

It is an arithmetic number, because the mean of its divisors is an integer number (1014552).

Almost surely, 2^18287328 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 18287328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24349248).

18287328 is an abundant number, since it is smaller than the sum of its proper divisors (30411168).

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

18287328 is a wasteful number, since it uses less digits than its factorization.

18287328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767 (or 2759 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 18287328 is about 4276.3685528729. The cubic root of 18287328 is about 263.4612520992.

The spelling of 18287328 in words is "eighteen million, two hundred eighty-seven thousand, three hundred twenty-eight".