28761676561 has 2 divisors, whose sum is σ = 28761676562. Its totient is φ = 28761676560.

The previous prime is 28761676549. The next prime is 28761676613. The reversal of 28761676561 is 16567616782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21574028161 + 7187648400 = 146881^2 + 84780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28761676561 is a prime.

It is not a weakly prime, because it can be changed into another prime (28761676501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14380838280 + 14380838281.

It is an arithmetic number, because the mean of its divisors is an integer number (14380838281).

Almost surely, 2^28761676561 is an apocalyptic number.

It is an amenable number.

28761676561 is a deficient number, since it is larger than the sum of its proper divisors (1).

28761676561 is an equidigital number, since it uses as much as digits as its factorization.

28761676561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 55.

The spelling of 28761676561 in words is "twenty-eight billion, seven hundred sixty-one million, six hundred seventy-six thousand, five hundred sixty-one".