28306776 has 64 divisors (see below), whose sum is σ = 73543680. Its totient is φ = 9072000.

The previous prime is 28306757. The next prime is 28306793. The reversal of 28306776 is 67760382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112651 + ... + 112901.

It is an arithmetic number, because the mean of its divisors is an integer number (1149120).

Almost surely, 2^28306776 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 28306776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36771840).

28306776 is an abundant number, since it is smaller than the sum of its proper divisors (45236904).

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

28306776 is a wasteful number, since it uses less digits than its factorization.

28306776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 28306776 is about 5320.4112622992. The cubic root of 28306776 is about 304.7638627323.

The spelling of 28306776 in words is "twenty-eight million, three hundred six thousand, seven hundred seventy-six".