28857831272 has 16 divisors (see below), whose sum is σ = 54281308740. Its totient is φ = 14382815616.

The previous prime is 28857831271. The next prime is 28857831287. The reversal of 28857831272 is 27213875882.

It can be written as a sum of positive squares in 2 ways, for example, as 19856755396 + 9001075876 = 140914^2 + 94874^2 .

It is a super-2 number, since 2×28857831272² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28857831271) 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, 5759843 + ... + 5764850.

Almost surely, 2^28857831272 is an apocalyptic number.

It is an amenable number.

28857831272 is a deficient number, since it is larger than the sum of its proper divisors (25423477468).

28857831272 is a wasteful number, since it uses less digits than its factorization.

28857831272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11525012 (or 11525008 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 53.

The spelling of 28857831272 in words is "twenty-eight billion, eight hundred fifty-seven million, eight hundred thirty-one thousand, two hundred seventy-two".