28687806 has 96 divisors (see below), whose sum is σ = 76826880. Its totient is φ = 7550208.

The previous prime is 28687801. The next prime is 28687807. The reversal of 28687806 is 60878682.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28687801) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 126265 + ... + 126491.

It is an arithmetic number, because the mean of its divisors is an integer number (800280).

Almost surely, 2^28687806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28687806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38413440).

28687806 is an abundant number, since it is smaller than the sum of its proper divisors (48139074).

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

28687806 is a wasteful number, since it uses less digits than its factorization.

28687806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 28687806 is about 5356.0998870447. The cubic root of 28687806 is about 306.1252210813.

The spelling of 28687806 in words is "twenty-eight million, six hundred eighty-seven thousand, eight hundred six".