28499213 has 8 divisors (see below), whose sum is σ = 29823768. Its totient is φ = 27203904.

The previous prime is 28499209. The next prime is 28499227. The reversal of 28499213 is 31299482.

It can be written as a sum of positive squares in 4 ways, for example, as 13853284 + 14645929 = 3722^2 + 3827^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28499213 - 2² = 28499209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28499203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5306 + ... + 9227.

It is an arithmetic number, because the mean of its divisors is an integer number (3727971).

Almost surely, 2^28499213 is an apocalyptic number.

It is an amenable number.

28499213 is a deficient number, since it is larger than the sum of its proper divisors (1324555).

28499213 is a wasteful number, since it uses less digits than its factorization.

28499213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14623.

The product of its digits is 31104, while the sum is 38.

The square root of 28499213 is about 5338.4654162034. The cubic root of 28499213 is about 305.4529255668.

The spelling of 28499213 in words is "twenty-eight million, four hundred ninety-nine thousand, two hundred thirteen".