28831057565 has 16 divisors (see below), whose sum is σ = 35827470336. Its totient is φ = 22249468800.

The previous prime is 28831057561. The next prime is 28831057597. The reversal of 28831057565 is 56575013882.

It is a happy number.

It is not a de Polignac number, because 28831057565 - 2² = 28831057561 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28831057561) 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, 248621 + ... + 345650.

It is an arithmetic number, because the mean of its divisors is an integer number (2239216896).

Almost surely, 2^28831057565 is an apocalyptic number.

It is an amenable number.

28831057565 is a deficient number, since it is larger than the sum of its proper divisors (6996412771).

28831057565 is a wasteful number, since it uses less digits than its factorization.

28831057565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594620.

The product of its (nonzero) digits is 2016000, while the sum is 50.

The spelling of 28831057565 in words is "twenty-eight billion, eight hundred thirty-one million, fifty-seven thousand, five hundred sixty-five".