28499813 has 4 divisors (see below), whose sum is σ = 29106240. Its totient is φ = 27893388.

The previous prime is 28499777. The next prime is 28499831. The reversal of 28499813 is 31899482.

It is a happy number.

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 28499813 - 2¹² = 28495717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28499873) 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, 303143 + ... + 303236.

It is an arithmetic number, because the mean of its divisors is an integer number (7276560).

Almost surely, 2^28499813 is an apocalyptic number.

It is an amenable number.

28499813 is a deficient number, since it is larger than the sum of its proper divisors (606427).

28499813 is an equidigital number, since it uses as much as digits as its factorization.

28499813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606426.

The product of its digits is 124416, while the sum is 44.

The square root of 28499813 is about 5338.5216118322. The cubic root of 28499813 is about 305.4550691402.

The spelling of 28499813 in words is "twenty-eight million, four hundred ninety-nine thousand, eight hundred thirteen".