28872586 has 4 divisors (see below), whose sum is σ = 43308882. Its totient is φ = 14436292.

The previous prime is 28872553. The next prime is 28872587. The reversal of 28872586 is 68527882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68527882 = 2 ⋅34263941.

It can be written as a sum of positive squares in only one way, i.e., 28355625 + 516961 = 5325^2 + 719^2 .

It is not an unprimeable number, because it can be changed into a prime (28872587) 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 as a sum of consecutive naturals, namely, 7218145 + ... + 7218148.

Almost surely, 2^28872586 is an apocalyptic number.

28872586 is a deficient number, since it is larger than the sum of its proper divisors (14436296).

28872586 is a wasteful number, since it uses less digits than its factorization.

28872586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14436295.

The product of its digits is 430080, while the sum is 46.

The square root of 28872586 is about 5373.3216914680. The cubic root of 28872586 is about 306.7810723636.

The spelling of 28872586 in words is "twenty-eight million, eight hundred seventy-two thousand, five hundred eighty-six".