28254531 has 4 divisors (see below), whose sum is σ = 37672712. Its totient is φ = 18836352.

The previous prime is 28254517. The next prime is 28254553. The reversal of 28254531 is 13545282.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28254531 - 2⁶ = 28254467 is a prime.

It is a super-2 number, since 2×28254531² = 1596637044059922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28254571) 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, 4709086 + ... + 4709091.

It is an arithmetic number, because the mean of its divisors is an integer number (9418178).

Almost surely, 2^28254531 is an apocalyptic number.

28254531 is a deficient number, since it is larger than the sum of its proper divisors (9418181).

28254531 is an equidigital number, since it uses as much as digits as its factorization.

28254531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9418180.

The product of its digits is 9600, while the sum is 30.

The square root of 28254531 is about 5315.4991299030. The cubic root of 28254531 is about 304.5762493037.

The spelling of 28254531 in words is "twenty-eight million, two hundred fifty-four thousand, five hundred thirty-one".