28717887 has 8 divisors (see below), whose sum is σ = 41771520. Its totient is φ = 17404760.

The previous prime is 28717877. The next prime is 28717901. The reversal of 28717887 is 78871782.

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 28717887 - 2¹⁵ = 28685119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28717807) 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, 435087 + ... + 435152.

It is an arithmetic number, because the mean of its divisors is an integer number (5221440).

Almost surely, 2^28717887 is an apocalyptic number.

28717887 is a deficient number, since it is larger than the sum of its proper divisors (13053633).

28717887 is a wasteful number, since it uses less digits than its factorization.

28717887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870253.

The product of its digits is 351232, while the sum is 48.

The square root of 28717887 is about 5358.9072580145. The cubic root of 28717887 is about 306.2321809985.

The spelling of 28717887 in words is "twenty-eight million, seven hundred seventeen thousand, eight hundred eighty-seven".