28820251 has 8 divisors (see below), whose sum is σ = 29346624. Its totient is φ = 28296840.

The previous prime is 28820221. The next prime is 28820263. The reversal of 28820251 is 15202882.

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 28820251 - 2¹⁵ = 28787483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28820221) 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, 29196 + ... + 30166.

It is an arithmetic number, because the mean of its divisors is an integer number (3668328).

Almost surely, 2^28820251 is an apocalyptic number.

28820251 is a deficient number, since it is larger than the sum of its proper divisors (526373).

28820251 is an equidigital number, since it uses as much as digits as its factorization.

28820251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 28820251 is about 5368.4495899654. The cubic root of 28820251 is about 306.5956011815.

The spelling of 28820251 in words is "twenty-eight million, eight hundred twenty thousand, two hundred fifty-one".