28540659844 has 12 divisors (see below), whose sum is σ = 50404377100. Its totient is φ = 14139409248.

The previous prime is 28540659841. The next prime is 28540659869. The reversal of 28540659844 is 44895604582.

It can be written as a sum of positive squares in 2 ways, for example, as 10231322500 + 18309337344 = 101150^2 + 135312^2 .

It is not an unprimeable number, because it can be changed into a prime (28540659841) 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, 32729679 + ... + 32730550.

Almost surely, 2^28540659844 is an apocalyptic number.

It is an amenable number.

28540659844 is a deficient number, since it is larger than the sum of its proper divisors (21863717256).

28540659844 is a wasteful number, since it uses less digits than its factorization.

28540659844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65460342 (or 65460340 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 55.

The spelling of 28540659844 in words is "twenty-eight billion, five hundred forty million, six hundred fifty-nine thousand, eight hundred forty-four".