28243231566 has 32 divisors (see below), whose sum is σ = 63609394176. Its totient is φ = 8282472000.

The previous prime is 28243231561. The next prime is 28243231567. The reversal of 28243231566 is 66513234282.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28243231561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6900015 + ... + 6904106.

It is an arithmetic number, because the mean of its divisors is an integer number (1987793568).

Almost surely, 2^28243231566 is an apocalyptic number.

28243231566 is an abundant number, since it is smaller than the sum of its proper divisors (35366162610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28243231566 is a wasteful number, since it uses less digits than its factorization.

28243231566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13804168.

The product of its digits is 414720, while the sum is 42.

The spelling of 28243231566 in words is "twenty-eight billion, two hundred forty-three million, two hundred thirty-one thousand, five hundred sixty-six".