28805766 has 32 divisors (see below), whose sum is σ = 63144576. Its totient is φ = 8688000.

The previous prime is 28805761. The next prime is 28805797. The reversal of 28805766 is 66750882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28805761) by changing a digit.

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, 15001 + ... + 16811.

It is an arithmetic number, because the mean of its divisors is an integer number (1973268).

Almost surely, 2^28805766 is an apocalyptic number.

28805766 is an abundant number, since it is smaller than the sum of its proper divisors (34338810).

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

28805766 is a wasteful number, since it uses less digits than its factorization.

28805766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2068.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 28805766 is about 5367.1003344450. The cubic root of 28805766 is about 306.5442277970.

Subtracting 28805766 from its reverse (66750882), we obtain a triangular number (37945116 = T₈₇₁₁).

It can be divided in two parts, 2880 and 5766, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 28805766 in words is "twenty-eight million, eight hundred five thousand, seven hundred sixty-six".