28557646563 has 8 divisors (see below), whose sum is σ = 38558848000. Its totient is φ = 18797438088.

The previous prime is 28557646541. The next prime is 28557646609. The reversal of 28557646563 is 36564675582.

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

It is not a de Polignac number, because 28557646563 - 2¹⁰ = 28557645539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28557646463) 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, 60247963 + ... + 60248436.

It is an arithmetic number, because the mean of its divisors is an integer number (4819856000).

Almost surely, 2^28557646563 is an apocalyptic number.

28557646563 is a deficient number, since it is larger than the sum of its proper divisors (10001201437).

28557646563 is a wasteful number, since it uses less digits than its factorization.

28557646563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120496481.

The product of its digits is 36288000, while the sum is 57.

The spelling of 28557646563 in words is "twenty-eight billion, five hundred fifty-seven million, six hundred forty-six thousand, five hundred sixty-three".