28322681521 has 4 divisors (see below), whose sum is σ = 28324095472. Its totient is φ = 28321267572.

The previous prime is 28322681461. The next prime is 28322681587. The reversal of 28322681521 is 12518622382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28322681521 - 2¹³ = 28322673329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28322681021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676491 + ... + 717136.

It is an arithmetic number, because the mean of its divisors is an integer number (7081023868).

Almost surely, 2^28322681521 is an apocalyptic number.

It is an amenable number.

28322681521 is a deficient number, since it is larger than the sum of its proper divisors (1413951).

28322681521 is a wasteful number, since it uses less digits than its factorization.

28322681521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413950.

The product of its digits is 92160, while the sum is 40.

The spelling of 28322681521 in words is "twenty-eight billion, three hundred twenty-two million, six hundred eighty-one thousand, five hundred twenty-one".