28540489 has 8 divisors (see below), whose sum is σ = 30131840. Its totient is φ = 26958096.

The previous prime is 28540441. The next prime is 28540507. The reversal of 28540489 is 98404582.

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 28540489 - 2⁷ = 28540361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28540189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4927 + ... + 9019.

It is an arithmetic number, because the mean of its divisors is an integer number (3766480).

Almost surely, 2^28540489 is an apocalyptic number.

It is an amenable number.

28540489 is a deficient number, since it is larger than the sum of its proper divisors (1591351).

28540489 is a wasteful number, since it uses less digits than its factorization.

28540489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4479.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 28540489 is about 5342.3299224215. The cubic root of 28540489 is about 305.6003190299.

The spelling of 28540489 in words is "twenty-eight million, five hundred forty thousand, four hundred eighty-nine".