28717864 has 16 divisors (see below), whose sum is σ = 61538400. Its totient is φ = 12307632.

The previous prime is 28717861. The next prime is 28717877. The reversal of 28717864 is 46871782.

It is a self number, because there is not a number n which added to its sum of digits gives 28717864.

It is not an unprimeable number, because it can be changed into a prime (28717861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256354 + ... + 256465.

It is an arithmetic number, because the mean of its divisors is an integer number (3846150).

Almost surely, 2^28717864 is an apocalyptic number.

It is an amenable number.

28717864 is an abundant number, since it is smaller than the sum of its proper divisors (32820536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28717864 is a wasteful number, since it uses less digits than its factorization.

28717864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512832 (or 512828 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The square root of 28717864 is about 5358.9051120541. The cubic root of 28717864 is about 306.2320992452.

The spelling of 28717864 in words is "twenty-eight million, seven hundred seventeen thousand, eight hundred sixty-four".