28393013 has 6 divisors (see below), whose sum is σ = 31208982. Its totient is φ = 25811720.

The previous prime is 28393003. The next prime is 28393031. The reversal of 28393013 is 31039382.

It can be written as a sum of positive squares in only one way, i.e., 14569489 + 13823524 = 3817^2 + 3718^2 .

It is not a de Polignac number, because 28393013 - 2⁴ = 28392997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28393003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117206 + ... + 117447.

It is an arithmetic number, because the mean of its divisors is an integer number (5201497).

Almost surely, 2^28393013 is an apocalyptic number.

It is an amenable number.

28393013 is a deficient number, since it is larger than the sum of its proper divisors (2815969).

28393013 is a wasteful number, since it uses less digits than its factorization.

28393013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234675 (or 234664 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 28393013 is about 5328.5094538717. The cubic root of 28393013 is about 305.0730381384.

The spelling of 28393013 in words is "twenty-eight million, three hundred ninety-three thousand, thirteen".