28561487 has 8 divisors (see below), whose sum is σ = 29339280. Its totient is φ = 27793600.

The previous prime is 28561471. The next prime is 28561493. The reversal of 28561487 is 78416582.

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 28561487 - 2⁴ = 28561471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28561457) 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, 3563 + ... + 8355.

It is an arithmetic number, because the mean of its divisors is an integer number (3667410).

Almost surely, 2^28561487 is an apocalyptic number.

28561487 is a deficient number, since it is larger than the sum of its proper divisors (777793).

28561487 is a wasteful number, since it uses less digits than its factorization.

28561487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4953.

The product of its digits is 107520, while the sum is 41.

The square root of 28561487 is about 5344.2948084850. The cubic root of 28561487 is about 305.6752467630.

The spelling of 28561487 in words is "twenty-eight million, five hundred sixty-one thousand, four hundred eighty-seven".