18428663 has 24 divisors (see below), whose sum is σ = 22216320. Its totient is φ = 15259200.

The previous prime is 18428633. The next prime is 18428713. The reversal of 18428663 is 36682481.

It is a happy number.

It is not a de Polignac number, because 18428663 - 2¹⁶ = 18363127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 594458 + ... + 594488.

It is an arithmetic number, because the mean of its divisors is an integer number (925680).

Almost surely, 2^18428663 is an apocalyptic number.

18428663 is a deficient number, since it is larger than the sum of its proper divisors (3787657).

18428663 is an equidigital number, since it uses as much as digits as its factorization.

18428663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 59 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 18428663 is about 4292.8618659351. The cubic root of 18428663 is about 264.1382377874.

It can be divided in two parts, 18428 and 663, that added together give a palindrome (19091).

The spelling of 18428663 in words is "eighteen million, four hundred twenty-eight thousand, six hundred sixty-three".