28325172681 has 48 divisors (see below), whose sum is σ = 46007270400. Its totient is φ = 16662070656.

The previous prime is 28325172653. The next prime is 28325172691. The reversal of 28325172681 is 18627152382.

28325172681 is a `hidden beast` number, since 2 + 8 + 32 + 517 + 26 + 81 = 666.

It is not a de Polignac number, because 28325172681 - 2¹¹ = 28325170633 is a prime.

It is a super-2 number, since 2×28325172681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28325172611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6103560 + ... + 6108198.

It is an arithmetic number, because the mean of its divisors is an integer number (958484800).

Almost surely, 2^28325172681 is an apocalyptic number.

It is an amenable number.

28325172681 is a deficient number, since it is larger than the sum of its proper divisors (17682097719).

28325172681 is a wasteful number, since it uses less digits than its factorization.

28325172681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6950 (or 6947 counting only the distinct ones).

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

The spelling of 28325172681 in words is "twenty-eight billion, three hundred twenty-five million, one hundred seventy-two thousand, six hundred eighty-one".