28542617521 has 8 divisors (see below), whose sum is σ = 31394736288. Its totient is φ = 25947832900.

The previous prime is 28542617503. The next prime is 28542617527. The reversal of 28542617521 is 12571624582.

It is not a de Polignac number, because 28542617521 - 2⁵ = 28542617489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28542617527) 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, 10720915 + ... + 10723576.

It is an arithmetic number, because the mean of its divisors is an integer number (3924342036).

Almost surely, 2^28542617521 is an apocalyptic number.

It is an amenable number.

28542617521 is a deficient number, since it is larger than the sum of its proper divisors (2852118767).

28542617521 is an equidigital number, since it uses as much as digits as its factorization.

28542617521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21444524 (or 21444502 counting only the distinct ones).

The product of its digits is 268800, while the sum is 43.

The spelling of 28542617521 in words is "twenty-eight billion, five hundred forty-two million, six hundred seventeen thousand, five hundred twenty-one".