28826261 has 6 divisors (see below), whose sum is σ = 29850210. Its totient is φ = 27804336.

The previous prime is 28826233. The next prime is 28826263. The reversal of 28826261 is 16262882.

It can be written as a sum of positive squares in 3 ways, for example, as 15062161 + 13764100 = 3881^2 + 3710^2 .

It is not a de Polignac number, because 28826261 - 2¹⁸ = 28564117 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 (28826263) 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, 28415 + ... + 29411.

It is an arithmetic number, because the mean of its divisors is an integer number (4975035).

Almost surely, 2^28826261 is an apocalyptic number.

It is an amenable number.

28826261 is a deficient number, since it is larger than the sum of its proper divisors (1023949).

28826261 is an frugal number, since it uses more digits than its factorization.

28826261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023 (or 1026 counting only the distinct ones).

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

The square root of 28826261 is about 5369.0093127131. The cubic root of 28826261 is about 306.6169115614.

The spelling of 28826261 in words is "twenty-eight million, eight hundred twenty-six thousand, two hundred sixty-one".