28398013 has 4 divisors (see below), whose sum is σ = 32454880. Its totient is φ = 24341148.

The previous prime is 28397987. The next prime is 28398037. The reversal of 28398013 is 31089382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28398013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28398013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28398053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2028423 + ... + 2028436.

It is an arithmetic number, because the mean of its divisors is an integer number (8113720).

Almost surely, 2^28398013 is an apocalyptic number.

It is an amenable number.

28398013 is a deficient number, since it is larger than the sum of its proper divisors (4056867).

28398013 is an equidigital number, since it uses as much as digits as its factorization.

28398013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056866.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 28398013 is about 5328.9786075758. The cubic root of 28398013 is about 305.0909448403.

The spelling of 28398013 in words is "twenty-eight million, three hundred ninety-eight thousand, thirteen".