28540566 has 24 divisors (see below), whose sum is σ = 63510840. Its totient is φ = 9500436.

The previous prime is 28540549. The next prime is 28540571. The reversal of 28540566 is 66504582.

It is a self number, because there is not a number n which added to its sum of digits gives 28540566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38895 + ... + 39621.

It is an arithmetic number, because the mean of its divisors is an integer number (2646285).

Almost surely, 2^28540566 is an apocalyptic number.

28540566 is an abundant number, since it is smaller than the sum of its proper divisors (34970274).

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

28540566 is an frugal number, since it uses more digits than its factorization.

28540566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 28540566 is about 5342.3371290101. The cubic root of 28540566 is about 305.6005938582.

The spelling of 28540566 in words is "twenty-eight million, five hundred forty thousand, five hundred sixty-six".