18049728 has 28 divisors (see below), whose sum is σ = 47757080. Its totient is φ = 6016512.

The previous prime is 18049727. The next prime is 18049729. The reversal of 18049728 is 82794081.

It is an interprime number because it is at equal distance from previous prime (18049727) and next prime (18049729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18049721) 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, 46813 + ... + 47196.

It is an arithmetic number, because the mean of its divisors is an integer number (1705610).

Almost surely, 2^18049728 is an apocalyptic number.

It is an amenable number.

18049728 is an abundant number, since it is smaller than the sum of its proper divisors (29707352).

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

18049728 is an equidigital number, since it uses as much as digits as its factorization.

18049728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94024 (or 94014 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 18049728 is about 4248.4971460506. The cubic root of 18049728 is about 262.3152586760.

The spelling of 18049728 in words is "eighteen million, forty-nine thousand, seven hundred twenty-eight".