28330776 has 64 divisors (see below), whose sum is σ = 81254400. Its totient is φ = 9136800.

The previous prime is 28330769. The next prime is 28330777. The reversal of 28330776 is 67703382.

28330776 is a `hidden beast` number, since 283 + 307 + 76 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28330776.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28330777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4581 + ... + 8811.

It is an arithmetic number, because the mean of its divisors is an integer number (1269600).

Almost surely, 2^28330776 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 28330776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40627200).

28330776 is an abundant number, since it is smaller than the sum of its proper divisors (52923624).

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

28330776 is a wasteful number, since it uses less digits than its factorization.

28330776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4277 (or 4267 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 28330776 is about 5322.6662491650. Note that the first 3 decimals coincide. The cubic root of 28330776 is about 304.8499701072.

The spelling of 28330776 in words is "twenty-eight million, three hundred thirty thousand, seven hundred seventy-six".