28131580297 has 16 divisors (see below), whose sum is σ = 31646313360. Its totient is φ = 24872859648.

The previous prime is 28131580289. The next prime is 28131580307. The reversal of 28131580297 is 79208513182.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5674759561 + 22456820736 = 75331^2 + 149856^2 .

It is a cyclic number.

It is not a de Polignac number, because 28131580297 - 2³ = 28131580289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28131580237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 752868 + ... + 789349.

It is an arithmetic number, because the mean of its divisors is an integer number (1977894585).

Almost surely, 2^28131580297 is an apocalyptic number.

It is an amenable number.

28131580297 is a deficient number, since it is larger than the sum of its proper divisors (3514733063).

28131580297 is a wasteful number, since it uses less digits than its factorization.

28131580297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542300.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 28131580297 in words is "twenty-eight billion, one hundred thirty-one million, five hundred eighty thousand, two hundred ninety-seven".