28981563 has 32 divisors (see below), whose sum is σ = 43201536. Its totient is φ = 17169408.

The previous prime is 28981531. The next prime is 28981571. The reversal of 28981563 is 36518982.

It is not a de Polignac number, because 28981563 - 2⁵ = 28981531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28981573) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177720 + ... + 177882.

It is an arithmetic number, because the mean of its divisors is an integer number (1350048).

Almost surely, 2^28981563 is an apocalyptic number.

28981563 is a deficient number, since it is larger than the sum of its proper divisors (14219973).

28981563 is a wasteful number, since it uses less digits than its factorization.

28981563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323.

The product of its digits is 103680, while the sum is 42.

The square root of 28981563 is about 5383.4527024949. The cubic root of 28981563 is about 307.1665603691.

The spelling of 28981563 in words is "twenty-eight million, nine hundred eighty-one thousand, five hundred sixty-three".