28098257 has 6 divisors (see below), whose sum is σ = 30884994. Its totient is φ = 25543760.

The previous prime is 28098253. The next prime is 28098269. The reversal of 28098257 is 75289082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21752896 + 6345361 = 4664^2 + 2519^2 .

It is not a de Polignac number, because 28098257 - 2² = 28098253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28098253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115988 + ... + 116229.

It is an arithmetic number, because the mean of its divisors is an integer number (5147499).

Almost surely, 2^28098257 is an apocalyptic number.

It is an amenable number.

28098257 is a deficient number, since it is larger than the sum of its proper divisors (2786737).

28098257 is a wasteful number, since it uses less digits than its factorization.

28098257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232239 (or 232228 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 28098257 is about 5300.7789050290. The cubic root of 28098257 is about 304.0136802766.

The spelling of 28098257 in words is "twenty-eight million, ninety-eight thousand, two hundred fifty-seven".