28284261 has 8 divisors (see below), whose sum is σ = 37745184. Its totient is φ = 18839760.

The previous prime is 28284257. The next prime is 28284283. The reversal of 28284261 is 16248282.

It is a happy number.

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

It is not a de Polignac number, because 28284261 - 2² = 28284257 is a prime.

It is a super-2 number, since 2×28284261² = 1599998840632242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28284211) 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, 730 + ... + 7556.

It is an arithmetic number, because the mean of its divisors is an integer number (4718148).

Almost surely, 2^28284261 is an apocalyptic number.

It is an amenable number.

28284261 is a deficient number, since it is larger than the sum of its proper divisors (9460923).

28284261 is a wasteful number, since it uses less digits than its factorization.

28284261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8211.

The product of its digits is 12288, while the sum is 33.

The square root of 28284261 is about 5318.2949335290. The cubic root of 28284261 is about 304.6830389932.

The spelling of 28284261 in words is "twenty-eight million, two hundred eighty-four thousand, two hundred sixty-one".