28820249 has 8 divisors (see below), whose sum is σ = 29522880. Its totient is φ = 28126000.

The previous prime is 28820221. The next prime is 28820263. The reversal of 28820249 is 94202882.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28820249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28820269) 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, 5162 + ... + 9180.

It is an arithmetic number, because the mean of its divisors is an integer number (3690360).

Almost surely, 2^28820249 is an apocalyptic number.

It is an amenable number.

28820249 is a deficient number, since it is larger than the sum of its proper divisors (702631).

28820249 is a wasteful number, since it uses less digits than its factorization.

28820249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 28820249 is about 5368.4494036919. The cubic root of 28820249 is about 306.5955940894.

The spelling of 28820249 in words is "twenty-eight million, eight hundred twenty thousand, two hundred forty-nine".