18728316 has 36 divisors (see below), whose sum is σ = 48976200. Its totient is φ = 6027168.

The previous prime is 18728291. The next prime is 18728321. The reversal of 18728316 is 61382781.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7926 + ... + 10013.

It is an arithmetic number, because the mean of its divisors is an integer number (1360450).

Almost surely, 2^18728316 is an apocalyptic number.

It is an amenable number.

18728316 is an abundant number, since it is smaller than the sum of its proper divisors (30247884).

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

18728316 is a wasteful number, since it uses less digits than its factorization.

18728316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17978 (or 17973 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18728316 is about 4327.6224419420. The cubic root of 18728316 is about 265.5621908426.

It can be divided in two parts, 18728 and 316, that added together give a square (19044 = 138²).

The spelling of 18728316 in words is "eighteen million, seven hundred twenty-eight thousand, three hundred sixteen".