28263399 has 8 divisors (see below), whose sum is σ = 37716480. Its totient is φ = 18826296.

The previous prime is 28263383. The next prime is 28263407. The reversal of 28263399 is 99336282.

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

It is not a de Polignac number, because 28263399 - 2⁴ = 28263383 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 self number, because there is not a number n which added to its sum of digits gives 28263399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28263349) 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, 1044 + ... + 7590.

It is an arithmetic number, because the mean of its divisors is an integer number (4714560).

Almost surely, 2^28263399 is an apocalyptic number.

28263399 is a deficient number, since it is larger than the sum of its proper divisors (9453081).

28263399 is a wasteful number, since it uses less digits than its factorization.

28263399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7989.

The product of its digits is 139968, while the sum is 42.

The square root of 28263399 is about 5316.3332288336. Note that the first 3 decimals coincide. The cubic root of 28263399 is about 304.6081108560.

The spelling of 28263399 in words is "twenty-eight million, two hundred sixty-three thousand, three hundred ninety-nine".