28882531 has 4 divisors (see below), whose sum is σ = 28911064. Its totient is φ = 28854000.

The previous prime is 28882519. The next prime is 28882537. The reversal of 28882531 is 13528882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13528882 = 2 ⋅6764441.

It is a cyclic number.

It is not a de Polignac number, because 28882531 - 2⁵ = 28882499 is a prime.

It is a super-2 number, since 2×28882531² = 1668401193931922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28882537) 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, 12690 + ... + 14791.

It is an arithmetic number, because the mean of its divisors is an integer number (7227766).

Almost surely, 2^28882531 is an apocalyptic number.

28882531 is a deficient number, since it is larger than the sum of its proper divisors (28533).

28882531 is a wasteful number, since it uses less digits than its factorization.

28882531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28532.

The product of its digits is 30720, while the sum is 37.

The square root of 28882531 is about 5374.2470170248. The cubic root of 28882531 is about 306.8162913258.

The spelling of 28882531 in words is "twenty-eight million, eight hundred eighty-two thousand, five hundred thirty-one".