18271968 has 120 divisors (see below), whose sum is σ = 56818440. Its totient is φ = 5111040.

The previous prime is 18271963. The next prime is 18272017. The reversal of 18271968 is 86917281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18271963) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1405530 + ... + 1405542.

It is an arithmetic number, because the mean of its divisors is an integer number (473487).

Almost surely, 2^18271968 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 18271968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28409220).

18271968 is an abundant number, since it is smaller than the sum of its proper divisors (38546472).

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

18271968 is an equidigital number, since it uses as much as digits as its factorization.

18271968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 29 counting only the distinct ones).

The product of its digits is 48384, while the sum is 42.

The square root of 18271968 is about 4274.5722593027. The cubic root of 18271968 is about 263.3874687968.

The spelling of 18271968 in words is "eighteen million, two hundred seventy-one thousand, nine hundred sixty-eight".