28299813 has 4 divisors (see below), whose sum is σ = 37733088. Its totient is φ = 18866540.

The previous prime is 28299811. The next prime is 28299839. The reversal of 28299813 is 31899282.

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 28299813 - 2¹ = 28299811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28299811) 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, 4716633 + ... + 4716638.

It is an arithmetic number, because the mean of its divisors is an integer number (9433272).

Almost surely, 2^28299813 is an apocalyptic number.

It is an amenable number.

28299813 is a deficient number, since it is larger than the sum of its proper divisors (9433275).

28299813 is an equidigital number, since it uses as much as digits as its factorization.

28299813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9433274.

The product of its digits is 62208, while the sum is 42.

The square root of 28299813 is about 5319.7568553459. The cubic root of 28299813 is about 304.7388717220.

The spelling of 28299813 in words is "twenty-eight million, two hundred ninety-nine thousand, eight hundred thirteen".