28400563 has 8 divisors (see below), whose sum is σ = 29301200. Its totient is φ = 27514080.

The previous prime is 28400543. The next prime is 28400569. The reversal of 28400563 is 36500482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28400563 - 2⁵ = 28400531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28400569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613 + ... + 7561.

It is an arithmetic number, because the mean of its divisors is an integer number (3662650).

Almost surely, 2^28400563 is an apocalyptic number.

28400563 is a deficient number, since it is larger than the sum of its proper divisors (900637).

28400563 is an equidigital number, since it uses as much as digits as its factorization.

28400563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7077.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 28400563 is about 5329.2178600616. The cubic root of 28400563 is about 305.1000764490.

The spelling of 28400563 in words is "twenty-eight million, four hundred thousand, five hundred sixty-three".