18428728 has 8 divisors (see below), whose sum is σ = 34553880. Its totient is φ = 9214360.

The previous prime is 18428719. The next prime is 18428737. The reversal of 18428728 is 82782481.

It is an interprime number because it is at equal distance from previous prime (18428719) and next prime (18428737).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1151788 + ... + 1151803.

It is an arithmetic number, because the mean of its divisors is an integer number (4319235).

Almost surely, 2^18428728 is an apocalyptic number.

It is an amenable number.

18428728 is a deficient number, since it is larger than the sum of its proper divisors (16125152).

18428728 is a wasteful number, since it uses less digits than its factorization.

18428728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303597 (or 2303593 counting only the distinct ones).

The product of its digits is 57344, while the sum is 40.

The square root of 18428728 is about 4292.8694366356. The cubic root of 18428728 is about 264.1385483356.

The spelling of 18428728 in words is "eighteen million, four hundred twenty-eight thousand, seven hundred twenty-eight".