28501563 has 8 divisors (see below), whose sum is σ = 38027776. Its totient is φ = 18988200.

The previous prime is 28501553. The next prime is 28501567. The reversal of 28501563 is 36510582.

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

It is not a de Polignac number, because 28501563 - 2⁴ = 28501547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28501563.

It is not an unprimeable number, because it can be changed into a prime (28501567) 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, 4878 + ... + 8988.

It is an arithmetic number, because the mean of its divisors is an integer number (4753472).

Almost surely, 2^28501563 is an apocalyptic number.

28501563 is a deficient number, since it is larger than the sum of its proper divisors (9526213).

28501563 is a wasteful number, since it uses less digits than its factorization.

28501563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6425.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 28501563 is about 5338.6855123710. The cubic root of 28501563 is about 305.4613210576.

The spelling of 28501563 in words is "twenty-eight million, five hundred one thousand, five hundred sixty-three".