28526281 has 15 divisors (see below), whose sum is σ = 33586791. Its totient is φ = 24226776.

The previous prime is 28526269. The next prime is 28526287. The reversal of 28526281 is 18262582.

The square root of 28526281 is 5341.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 19882681 + 8643600 = 4459^2 + 2940^2 .

It is not a de Polignac number, because 28526281 - 2⁵ = 28526249 is a prime.

It is a super-2 number, since 2×28526281² = 1627497415381922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28526287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 261655 + ... + 261763.

Almost surely, 2^28526281 is an apocalyptic number.

28526281 is the 5341-st square number.

28526281 is the 2671-st centered octagonal number.

It is an amenable number.

28526281 is a deficient number, since it is larger than the sum of its proper divisors (5060510).

28526281 is an frugal number, since it uses more digits than its factorization.

28526281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 116 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The cubic root of 28526281 is about 305.5495993893.

The spelling of 28526281 in words is "twenty-eight million, five hundred twenty-six thousand, two hundred eighty-one".