28513491 has 16 divisors (see below), whose sum is σ = 40642560. Its totient is φ = 17737280.

The previous prime is 28513453. The next prime is 28513493. The reversal of 28513491 is 19431582.

It is a cyclic number.

It is not a de Polignac number, because 28513491 - 2¹¹ = 28511443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28513493) 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 15 ways as a sum of consecutive naturals, for example, 2211 + ... + 7868.

It is an arithmetic number, because the mean of its divisors is an integer number (2540160).

Almost surely, 2^28513491 is an apocalyptic number.

28513491 is a deficient number, since it is larger than the sum of its proper divisors (12129069).

28513491 is a wasteful number, since it uses less digits than its factorization.

28513491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10146.

The product of its digits is 8640, while the sum is 33.

The square root of 28513491 is about 5339.8025244385. The cubic root of 28513491 is about 305.5039273114.

The spelling of 28513491 in words is "twenty-eight million, five hundred thirteen thousand, four hundred ninety-one".