28894531 has 4 divisors (see below), whose sum is σ = 28969200. Its totient is φ = 28819864.

The previous prime is 28894529. The next prime is 28894549. The reversal of 28894531 is 13549882.

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

It is a cyclic number.

It is not a de Polignac number, because 28894531 - 2¹ = 28894529 is a prime.

It is a super-2 number, since 2×28894531² = 1669787843419922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28894501) 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 3 ways as a sum of consecutive naturals, for example, 36751 + ... + 37528.

It is an arithmetic number, because the mean of its divisors is an integer number (7242300).

Almost surely, 2^28894531 is an apocalyptic number.

28894531 is a deficient number, since it is larger than the sum of its proper divisors (74669).

28894531 is an equidigital number, since it uses as much as digits as its factorization.

28894531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74668.

The product of its digits is 69120, while the sum is 40.

The square root of 28894531 is about 5375.3633365569. The cubic root of 28894531 is about 306.8587770497.

The spelling of 28894531 in words is "twenty-eight million, eight hundred ninety-four thousand, five hundred thirty-one".