18268640 has 48 divisors (see below), whose sum is σ = 46484928. Its totient is φ = 6744576.

The previous prime is 18268619. The next prime is 18268643. The reversal of 18268640 is 4686281.

It is a self number, because there is not a number n which added to its sum of digits gives 18268640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18268643) 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, 2312 + ... + 6471.

It is an arithmetic number, because the mean of its divisors is an integer number (968436).

Almost surely, 2^18268640 is an apocalyptic number.

18268640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18268640 is an abundant number, since it is smaller than the sum of its proper divisors (28216288).

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

18268640 is a wasteful number, since it uses less digits than its factorization.

18268640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8811 (or 8803 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 18268640 is about 4274.1829628597. The cubic root of 18268640 is about 263.3714769650.

The spelling of 18268640 in words is "eighteen million, two hundred sixty-eight thousand, six hundred forty".