28255563 has 24 divisors (see below), whose sum is σ = 46862816. Its totient is φ = 16070400.

The previous prime is 28255559. The next prime is 28255589. The reversal of 28255563 is 36555282.

It is a happy number.

It is not a de Polignac number, because 28255563 - 2² = 28255559 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28255543) 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, 14253 + ... + 16113.

Almost surely, 2^28255563 is an apocalyptic number.

28255563 is a deficient number, since it is larger than the sum of its proper divisors (18607253).

28255563 is a wasteful number, since it uses less digits than its factorization.

28255563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115 (or 2112 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 28255563 is about 5315.5962036257. The cubic root of 28255563 is about 304.5799574861.

The spelling of 28255563 in words is "twenty-eight million, two hundred fifty-five thousand, five hundred sixty-three".