28172852613 has 24 divisors (see below), whose sum is σ = 41807759448. Its totient is φ = 18268250112.

The previous prime is 28172852581. The next prime is 28172852677. The reversal of 28172852613 is 31625827182.

28172852613 is a `hidden beast` number, since 2 + 8 + 1 + 7 + 28 + 5 + 2 + 613 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5146914564 + 23025938049 = 71742^2 + 151743^2 .

It is not a de Polignac number, because 28172852613 - 2⁵ = 28172852581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28172852413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1138945 + ... + 1163417.

It is an arithmetic number, because the mean of its divisors is an integer number (1741989977).

Almost surely, 2^28172852613 is an apocalyptic number.

It is an amenable number.

28172852613 is a deficient number, since it is larger than the sum of its proper divisors (13634906835).

28172852613 is a wasteful number, since it uses less digits than its factorization.

28172852613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27973 (or 27970 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 28172852613 in words is "twenty-eight billion, one hundred seventy-two million, eight hundred fifty-two thousand, six hundred thirteen".