28666782 has 48 divisors (see below), whose sum is σ = 66066000. Its totient is φ = 8957952.

The previous prime is 28666769. The next prime is 28666793. The reversal of 28666782 is 28766682.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36894 + ... + 37662.

It is an arithmetic number, because the mean of its divisors is an integer number (1376375).

Almost surely, 2^28666782 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28666782, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33033000).

28666782 is an abundant number, since it is smaller than the sum of its proper divisors (37399218).

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

28666782 is a wasteful number, since it uses less digits than its factorization.

28666782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905 (or 902 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28666782 is about 5354.1369052351. The cubic root of 28666782 is about 306.0504210135.

The spelling of 28666782 in words is "twenty-eight million, six hundred sixty-six thousand, seven hundred eighty-two".