28555521567 has 8 divisors (see below), whose sum is σ = 39302223360. Its totient is φ = 18422917080.

The previous prime is 28555521563. The next prime is 28555521679. The reversal of 28555521567 is 76512555582.

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

It is not a de Polignac number, because 28555521567 - 2² = 28555521563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28555521563) 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, 153524217 + ... + 153524402.

It is an arithmetic number, because the mean of its divisors is an integer number (4912777920).

Almost surely, 2^28555521567 is an apocalyptic number.

28555521567 is a deficient number, since it is larger than the sum of its proper divisors (10746701793).

28555521567 is a wasteful number, since it uses less digits than its factorization.

28555521567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307048653.

The product of its digits is 4200000, while the sum is 51.

The spelling of 28555521567 in words is "twenty-eight billion, five hundred fifty-five million, five hundred twenty-one thousand, five hundred sixty-seven".