28569555 has 24 divisors (see below), whose sum is σ = 56595552. Its totient is φ = 13060224.

The previous prime is 28569517. The next prime is 28569557. The reversal of 28569555 is 55596582.

It is not a de Polignac number, because 28569555 - 2⁹ = 28569043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28569555.

It is not an unprimeable number, because it can be changed into a prime (28569557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45034 + ... + 45663.

It is an arithmetic number, because the mean of its divisors is an integer number (2358148).

Almost surely, 2^28569555 is an apocalyptic number.

28569555 is a deficient number, since it is larger than the sum of its proper divisors (28025997).

28569555 is a wasteful number, since it uses less digits than its factorization.

28569555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90715 (or 90712 counting only the distinct ones).

The product of its digits is 540000, while the sum is 45.

The square root of 28569555 is about 5345.0495788159. The cubic root of 28569555 is about 305.7040262602.

The spelling of 28569555 in words is "twenty-eight million, five hundred sixty-nine thousand, five hundred fifty-five".