28715808 has 96 divisors (see below), whose sum is σ = 83607552. Its totient is φ = 8556800.

The previous prime is 28715807. The next prime is 28715833. The reversal of 28715808 is 80851782.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (28715803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74785 + ... + 75167.

It is an arithmetic number, because the mean of its divisors is an integer number (870912).

Almost surely, 2^28715808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28715808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41803776).

28715808 is an abundant number, since it is smaller than the sum of its proper divisors (54891744).

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

28715808 is a wasteful number, since it uses less digits than its factorization.

28715808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 28715808 is about 5358.7132783906. The cubic root of 28715808 is about 306.2247910390.

The spelling of 28715808 in words is "twenty-eight million, seven hundred fifteen thousand, eight hundred eight".