28216398 has 32 divisors (see below), whose sum is σ = 65385216. Its totient is φ = 7950528.

The previous prime is 28216393. The next prime is 28216399. The reversal of 28216398 is 89361282.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28216393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1536 + ... + 7667.

It is an arithmetic number, because the mean of its divisors is an integer number (2043288).

Almost surely, 2^28216398 is an apocalyptic number.

28216398 is an abundant number, since it is smaller than the sum of its proper divisors (37168818).

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

28216398 is a wasteful number, since it uses less digits than its factorization.

28216398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9288.

The product of its digits is 41472, while the sum is 39.

The square root of 28216398 is about 5311.9109555790. The cubic root of 28216398 is about 304.4391664518.

The spelling of 28216398 in words is "twenty-eight million, two hundred sixteen thousand, three hundred ninety-eight".