18678272 has 30 divisors (see below), whose sum is σ = 37516479. Its totient is φ = 9290240.

The previous prime is 18678269. The next prime is 18678281. The reversal of 18678272 is 27287681.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 9339136 + 9339136 = 3056^2 + 3056^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3056.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 97697 + ... + 97887.

Almost surely, 2^18678272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18678272

18678272 is an abundant number, since it is smaller than the sum of its proper divisors (18838207).

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

18678272 is an frugal number, since it uses more digits than its factorization.

18678272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 193 counting only the distinct ones).

The product of its digits is 75264, while the sum is 41.

The square root of 18678272 is about 4321.8366466122. The cubic root of 18678272 is about 265.3254432867.

The spelling of 18678272 in words is "eighteen million, six hundred seventy-eight thousand, two hundred seventy-two".