28517489 has 32 divisors (see below), whose sum is σ = 39567360. Its totient is φ = 19828800.

The previous prime is 28517479. The next prime is 28517519. The reversal of 28517489 is 98471582.

It is a cyclic number.

It is not a de Polignac number, because 28517489 - 2¹² = 28513393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28517429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30572 + ... + 31490.

It is an arithmetic number, because the mean of its divisors is an integer number (1236480).

Almost surely, 2^28517489 is an apocalyptic number.

It is an amenable number.

28517489 is a deficient number, since it is larger than the sum of its proper divisors (11049871).

28517489 is a wasteful number, since it uses less digits than its factorization.

28517489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981.

The product of its digits is 161280, while the sum is 44.

The square root of 28517489 is about 5340.1768697301. The cubic root of 28517489 is about 305.5182053201.

The spelling of 28517489 in words is "twenty-eight million, five hundred seventeen thousand, four hundred eighty-nine".