18119728 has 20 divisors (see below), whose sum is σ = 38298888. Its totient is φ = 8236160.

The previous prime is 18119719. The next prime is 18119737. The reversal of 18119728 is 82791181.

It is an interprime number because it is at equal distance from previous prime (18119719) and next prime (18119737).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51301 + ... + 51652.

Almost surely, 2^18119728 is an apocalyptic number.

It is an amenable number.

18119728 is an abundant number, since it is smaller than the sum of its proper divisors (20179160).

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

18119728 is a wasteful number, since it uses less digits than its factorization.

18119728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102972 (or 102966 counting only the distinct ones).

The product of its digits is 8064, while the sum is 37.

The square root of 18119728 is about 4256.7273814516. The cubic root of 18119728 is about 262.6539227271.

The spelling of 18119728 in words is "eighteen million, one hundred nineteen thousand, seven hundred twenty-eight".