28065580 has 48 divisors (see below), whose sum is σ = 61165440. Its totient is φ = 10810368.

The previous prime is 28065539. The next prime is 28065581. The reversal of 28065580 is 8556082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28065581) 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, 68416 + ... + 68824.

It is an arithmetic number, because the mean of its divisors is an integer number (1274280).

Almost surely, 2^28065580 is an apocalyptic number.

28065580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28065580 is an abundant number, since it is smaller than the sum of its proper divisors (33099860).

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

28065580 is a wasteful number, since it uses less digits than its factorization.

28065580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538 (or 536 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 28065580 is about 5297.6957255018. The cubic root of 28065580 is about 303.8957831824.

The spelling of 28065580 in words is "twenty-eight million, sixty-five thousand, five hundred eighty".