28066830 has 64 divisors (see below), whose sum is σ = 77822208. Its totient is φ = 6402560.

The previous prime is 28066793. The next prime is 28066879. The reversal of 28066830 is 3866082.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 28066791 and 28066800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3109 + ... + 8111.

It is an arithmetic number, because the mean of its divisors is an integer number (1215972).

Almost surely, 2^28066830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28066830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38911104).

28066830 is an abundant number, since it is smaller than the sum of its proper divisors (49755378).

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

28066830 is a wasteful number, since it uses less digits than its factorization.

28066830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5041.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 28066830 is about 5297.8137000087. The cubic root of 28066830 is about 303.9002948071.

The spelling of 28066830 in words is "twenty-eight million, sixty-six thousand, eight hundred thirty".