28405563 has 4 divisors (see below), whose sum is σ = 37874088. Its totient is φ = 18937040.

The previous prime is 28405561. The next prime is 28405567. The reversal of 28405563 is 36550482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28405563 - 2¹ = 28405561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28405561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4734258 + ... + 4734263.

It is an arithmetic number, because the mean of its divisors is an integer number (9468522).

Almost surely, 2^28405563 is an apocalyptic number.

28405563 is a deficient number, since it is larger than the sum of its proper divisors (9468525).

28405563 is an equidigital number, since it uses as much as digits as its factorization.

28405563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9468524.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 28405563 is about 5329.6869514072. The cubic root of 28405563 is about 305.1179799775.

The spelling of 28405563 in words is "twenty-eight million, four hundred five thousand, five hundred sixty-three".