28343513 has 4 divisors (see below), whose sum is σ = 30920208. Its totient is φ = 25766820.

The previous prime is 28343507. The next prime is 28343537. The reversal of 28343513 is 31534382.

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 not a de Polignac number, because 28343513 - 2⁶ = 28343449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28343543) 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, 1288331 + ... + 1288352.

It is an arithmetic number, because the mean of its divisors is an integer number (7730052).

Almost surely, 2^28343513 is an apocalyptic number.

It is an amenable number.

28343513 is a deficient number, since it is larger than the sum of its proper divisors (2576695).

28343513 is a wasteful number, since it uses less digits than its factorization.

28343513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576694.

The product of its digits is 8640, while the sum is 29.

The square root of 28343513 is about 5323.8626015328. The cubic root of 28343513 is about 304.8956482574.

Adding to 28343513 its reverse (31534382), we get a palindrome (59877895).

The spelling of 28343513 in words is "twenty-eight million, three hundred forty-three thousand, five hundred thirteen".