28491579 has 12 divisors (see below), whose sum is σ = 41314416. Its totient is φ = 18920592.

The previous prime is 28491577. The next prime is 28491599. The reversal of 28491579 is 97519482.

It is not a de Polignac number, because 28491579 - 2¹ = 28491577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28491571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3652 + ... + 8385.

It is an arithmetic number, because the mean of its divisors is an integer number (3442868).

Almost surely, 2^28491579 is an apocalyptic number.

28491579 is a deficient number, since it is larger than the sum of its proper divisors (12822837).

28491579 is a wasteful number, since it uses less digits than its factorization.

28491579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12306 (or 12303 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 28491579 is about 5337.7503688352. The cubic root of 28491579 is about 305.4256495402.

The spelling of 28491579 in words is "twenty-eight million, four hundred ninety-one thousand, five hundred seventy-nine".