28645161831 has 72 divisors (see below), whose sum is σ = 50199145776. Its totient is φ = 15591813120.

The previous prime is 28645161827. The next prime is 28645161841. The reversal of 28645161831 is 13816154682.

28645161831 is a `hidden beast` number, since 28 + 6 + 4 + 5 + 1 + 618 + 3 + 1 = 666.

It is not a de Polignac number, because 28645161831 - 2² = 28645161827 is a prime.

It is a super-2 number, since 2×28645161831² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28645161841) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 595911 + ... + 642183.

It is an arithmetic number, because the mean of its divisors is an integer number (697210358).

Almost surely, 2^28645161831 is an apocalyptic number.

28645161831 is a deficient number, since it is larger than the sum of its proper divisors (21553983945).

28645161831 is a wasteful number, since it uses less digits than its factorization.

28645161831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46353 (or 46337 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 28645161831 in words is "twenty-eight billion, six hundred forty-five million, one hundred sixty-one thousand, eight hundred thirty-one".