28504487 has 8 divisors (see below), whose sum is σ = 31138560. Its totient is φ = 25877560.

The previous prime is 28504459. The next prime is 28504499. The reversal of 28504487 is 78440582.

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 28504487 - 2¹⁸ = 28242343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28504487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28504417) 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, 9938 + ... + 12480.

It is an arithmetic number, because the mean of its divisors is an integer number (3892320).

Almost surely, 2^28504487 is an apocalyptic number.

28504487 is a deficient number, since it is larger than the sum of its proper divisors (2634073).

28504487 is a wasteful number, since it uses less digits than its factorization.

28504487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3573.

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 28504487 is about 5338.9593555299. The cubic root of 28504487 is about 305.4717665475.

It can be divided in two parts, 2850 and 4487, that added together give a palindrome (7337).

The spelling of 28504487 in words is "twenty-eight million, five hundred four thousand, four hundred eighty-seven".