28522987 has 4 divisors (see below), whose sum is σ = 28843560. Its totient is φ = 28202416.

The previous prime is 28522981. The next prime is 28522993. The reversal of 28522987 is 78922582.

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

It is an interprime number because it is at equal distance from previous prime (28522981) and next prime (28522993).

It is a cyclic number.

It is not a de Polignac number, because 28522987 - 2¹¹ = 28520939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28522981) 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, 160153 + ... + 160330.

It is an arithmetic number, because the mean of its divisors is an integer number (7210890).

Almost surely, 2^28522987 is an apocalyptic number.

28522987 is a deficient number, since it is larger than the sum of its proper divisors (320573).

28522987 is an equidigital number, since it uses as much as digits as its factorization.

28522987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320572.

The product of its digits is 161280, while the sum is 43.

The square root of 28522987 is about 5340.6916218782. The cubic root of 28522987 is about 305.5378380813.

The spelling of 28522987 in words is "twenty-eight million, five hundred twenty-two thousand, nine hundred eighty-seven".