18768728 has 16 divisors (see below), whose sum is σ = 38390760. Its totient is φ = 8531200.

The previous prime is 18768727. The next prime is 18768773. The reversal of 18768728 is 82786781.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18768721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106553 + ... + 106728.

Almost surely, 2^18768728 is an apocalyptic number.

It is an amenable number.

18768728 is an abundant number, since it is smaller than the sum of its proper divisors (19622032).

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

18768728 is a wasteful number, since it uses less digits than its factorization.

18768728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213298 (or 213294 counting only the distinct ones).

The product of its digits is 301056, while the sum is 47.

The square root of 18768728 is about 4332.2890023635. The cubic root of 18768728 is about 265.7530638393.

The spelling of 18768728 in words is "eighteen million, seven hundred sixty-eight thousand, seven hundred twenty-eight".