28497610538 has 16 divisors (see below), whose sum is σ = 42803171880. Its totient is φ = 14229902016.

The previous prime is 28497610487. The next prime is 28497610543. The reversal of 28497610538 is 83501679482.

It can be written as a sum of positive squares in 4 ways, for example, as 28494452809 + 3157729 = 168803^2 + 1777^2 .

It is a super-2 number, since 2×28497610538² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28497610538.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8823908 + ... + 8827136.

It is a 1-persistent number, because it is pandigital, but 2⋅28497610538 = 56995221076 is not.

Almost surely, 2^28497610538 is an apocalyptic number.

28497610538 is a deficient number, since it is larger than the sum of its proper divisors (14305561342).

28497610538 is a wasteful number, since it uses less digits than its factorization.

28497610538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7721.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 28497610538 in words is "twenty-eight billion, four hundred ninety-seven million, six hundred ten thousand, five hundred thirty-eight".