18028641 has 8 divisors (see below), whose sum is σ = 24308640. Its totient is φ = 11883872.

The previous prime is 18028631. The next prime is 18028667. The reversal of 18028641 is 14682081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18028641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18028599 and 18028608.

It is not an unprimeable number, because it can be changed into a prime (18028631) 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, 33495 + ... + 34028.

It is an arithmetic number, because the mean of its divisors is an integer number (3038580).

Almost surely, 2^18028641 is an apocalyptic number.

It is an amenable number.

18028641 is a deficient number, since it is larger than the sum of its proper divisors (6279999).

18028641 is an equidigital number, since it uses as much as digits as its factorization.

18028641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67615.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18028641 is about 4246.0147197107. The cubic root of 18028641 is about 262.2130669729.

The spelling of 18028641 in words is "eighteen million, twenty-eight thousand, six hundred forty-one".