28398783 has 12 divisors (see below), whose sum is σ = 44047320. Its totient is φ = 16227792.

The previous prime is 28398781. The next prime is 28398809. The reversal of 28398783 is 38789382.

It is not a de Polignac number, because 28398783 - 2¹ = 28398781 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28398781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96448 + ... + 96741.

It is an arithmetic number, because the mean of its divisors is an integer number (3670610).

Almost surely, 2^28398783 is an apocalyptic number.

28398783 is a deficient number, since it is larger than the sum of its proper divisors (15648537).

28398783 is a wasteful number, since it uses less digits than its factorization.

28398783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193206 (or 193199 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 28398783 is about 5329.0508535761. The cubic root of 28398783 is about 305.0937022857.

The spelling of 28398783 in words is "twenty-eight million, three hundred ninety-eight thousand, seven hundred eighty-three".