28547664731 has 2 divisors, whose sum is σ = 28547664732. Its totient is φ = 28547664730.

The previous prime is 28547664727. The next prime is 28547664793. The reversal of 28547664731 is 13746674582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28547664731 - 2² = 28547664727 is a prime.

It is a super-2 number, since 2×28547664731² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28547660731) 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 as a sum of consecutive naturals, namely, 14273832365 + 14273832366.

It is an arithmetic number, because the mean of its divisors is an integer number (14273832366).

Almost surely, 2^28547664731 is an apocalyptic number.

28547664731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28547664731 is an equidigital number, since it uses as much as digits as its factorization.

28547664731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6773760, while the sum is 53.

The spelling of 28547664731 in words is "twenty-eight billion, five hundred forty-seven million, six hundred sixty-four thousand, seven hundred thirty-one".