28971768 has 64 divisors (see below), whose sum is σ = 83185920. Its totient is φ = 8236800.

The previous prime is 28971739. The next prime is 28971779. The reversal of 28971768 is 86717982.

Its product of digits (338688) is a multiple of the sum of its prime divisors (864).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55348 + ... + 55868.

It is an arithmetic number, because the mean of its divisors is an integer number (1299780).

Almost surely, 2^28971768 is an apocalyptic number.

28971768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28971768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41592960).

28971768 is an abundant number, since it is smaller than the sum of its proper divisors (54214152).

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

28971768 is a wasteful number, since it uses less digits than its factorization.

28971768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868 (or 864 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 28971768 is about 5382.5428934659. The cubic root of 28971768 is about 307.1319517517.

The spelling of 28971768 in words is "twenty-eight million, nine hundred seventy-one thousand, seven hundred sixty-eight".