28513389 has 8 divisors (see below), whose sum is σ = 38063232. Its totient is φ = 18986240.

The previous prime is 28513367. The next prime is 28513393. The reversal of 28513389 is 98331582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28513389 - 2¹⁷ = 28382317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28513339) 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 7 ways as a sum of consecutive naturals, for example, 2484 + ... + 7949.

It is an arithmetic number, because the mean of its divisors is an integer number (4757904).

Almost surely, 2^28513389 is an apocalyptic number.

It is an amenable number.

28513389 is a deficient number, since it is larger than the sum of its proper divisors (9549843).

28513389 is a wasteful number, since it uses less digits than its factorization.

28513389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11347.

The product of its digits is 51840, while the sum is 39.

The square root of 28513389 is about 5339.7929735150. The cubic root of 28513389 is about 305.5035630226.

The spelling of 28513389 in words is "twenty-eight million, five hundred thirteen thousand, three hundred eighty-nine".