28265680 has 20 divisors (see below), whose sum is σ = 65717892. Its totient is φ = 11306240.

The previous prime is 28265641. The next prime is 28265681. The reversal of 28265680 is 8656282.

It can be written as a sum of positive squares in 2 ways, for example, as 19289664 + 8976016 = 4392^2 + 2996^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28265681) 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 3 ways as a sum of consecutive naturals, for example, 176581 + ... + 176740.

Almost surely, 2^28265680 is an apocalyptic number.

28265680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28265680 is an abundant number, since it is smaller than the sum of its proper divisors (37452212).

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

28265680 is a wasteful number, since it uses less digits than its factorization.

28265680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353334 (or 353328 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 28265680 is about 5316.5477520662. The cubic root of 28265680 is about 304.6163051100.

The spelling of 28265680 in words is "twenty-eight million, two hundred sixty-five thousand, six hundred eighty".