28226531 has 4 divisors (see below), whose sum is σ = 28485600. Its totient is φ = 27967464.

The previous prime is 28226503. The next prime is 28226537. The reversal of 28226531 is 13562282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13562282 = 2 ⋅6781141.

It is a cyclic number.

It is not a de Polignac number, because 28226531 - 2⁶ = 28226467 is a prime.

It is a super-3 number, since 3×28226531³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28226494 and 28226503.

It is not an unprimeable number, because it can be changed into a prime (28226537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129371 + ... + 129588.

It is an arithmetic number, because the mean of its divisors is an integer number (7121400).

Almost surely, 2^28226531 is an apocalyptic number.

28226531 is a deficient number, since it is larger than the sum of its proper divisors (259069).

28226531 is a wasteful number, since it uses less digits than its factorization.

28226531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259068.

The product of its digits is 5760, while the sum is 29.

The square root of 28226531 is about 5312.8646698368. The cubic root of 28226531 is about 304.4756052261.

The spelling of 28226531 in words is "twenty-eight million, two hundred twenty-six thousand, five hundred thirty-one".