12287172528 has 280 divisors, whose sum is σ = 37266962976. Its totient is φ = 3919104000.

The previous prime is 12287172523. The next prime is 12287172553. The reversal of 12287172528 is 82527178221.

It is not an unprimeable number, because it can be changed into a prime (12287172523) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 30641128 + ... + 30641528.

Almost surely, 2^12287172528 is an apocalyptic number.

12287172528 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12287172528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18633481488).

12287172528 is an abundant number, since it is smaller than the sum of its proper divisors (24979790448).

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

12287172528 is an equidigital number, since it uses as much as digits as its factorization.

12287172528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 514 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The spelling of 12287172528 in words is "twelve billion, two hundred eighty-seven million, one hundred seventy-two thousand, five hundred twenty-eight".