28408893 has 8 divisors (see below), whose sum is σ = 39184800. Its totient is φ = 18286128.

The previous prime is 28408883. The next prime is 28408907. The reversal of 28408893 is 39880482.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28408893 - 2¹⁴ = 28392509 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28408873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163183 + ... + 163356.

It is an arithmetic number, because the mean of its divisors is an integer number (4898100).

Almost surely, 2^28408893 is an apocalyptic number.

It is an amenable number.

28408893 is a deficient number, since it is larger than the sum of its proper divisors (10775907).

28408893 is a wasteful number, since it uses less digits than its factorization.

28408893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326571.

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 28408893 is about 5329.9993433395. Note that the first 3 decimals coincide. The cubic root of 28408893 is about 305.1299025620.

The spelling of 28408893 in words is "twenty-eight million, four hundred eight thousand, eight hundred ninety-three".