28524000991 has 4 divisors (see below), whose sum is σ = 28748599552. Its totient is φ = 28299402432.

The previous prime is 28524000979. The next prime is 28524000997. The reversal of 28524000991 is 19900042582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28524000991 - 2⁵ = 28524000959 is a prime.

It is the 168891-st Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28524000997) by changing a digit.

It is a nontrivial repunit in base 168890.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112299090 + ... + 112299343.

It is an arithmetic number, because the mean of its divisors is an integer number (7187149888).

Almost surely, 2^28524000991 is an apocalyptic number.

28524000991 is a deficient number, since it is larger than the sum of its proper divisors (224598561).

28524000991 is a wasteful number, since it uses less digits than its factorization.

28524000991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224598560.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 28524000991 in words is "twenty-eight billion, five hundred twenty-four million, nine hundred ninety-one", and thus it is an aban number.