28242013 has 4 divisors (see below), whose sum is σ = 28898848. Its totient is φ = 27585180.

The previous prime is 28242007. The next prime is 28242047. The reversal of 28242013 is 31024282.

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-28242013 is a prime.

It is a super-2 number, since 2×28242013² = 1595222596584338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28242073) 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, 328353 + ... + 328438.

It is an arithmetic number, because the mean of its divisors is an integer number (7224712).

Almost surely, 2^28242013 is an apocalyptic number.

It is an amenable number.

28242013 is a deficient number, since it is larger than the sum of its proper divisors (656835).

28242013 is an equidigital number, since it uses as much as digits as its factorization.

28242013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656834.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 28242013 is about 5314.3214994955. The cubic root of 28242013 is about 304.5312624343.

Adding to 28242013 its reverse (31024282), we get a palindrome (59266295).

The spelling of 28242013 in words is "twenty-eight million, two hundred forty-two thousand, thirteen".