28994375364257 has 2 divisors, whose sum is σ = 28994375364258. Its totient is φ = 28994375364256.

The previous prime is 28994375364223. The next prime is 28994375364277. The reversal of 28994375364257 is 75246357349982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28292707789921 + 701667574336 = 5319089^2 + 837656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28994375364257 is a prime.

It is not a weakly prime, because it can be changed into another prime (28994375364217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14497187682128 + 14497187682129.

It is an arithmetic number, because the mean of its divisors is an integer number (14497187682129).

Almost surely, 2^{28994375364257} is an apocalyptic number.

It is an amenable number.

28994375364257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28994375364257 is an equidigital number, since it uses as much as digits as its factorization.

28994375364257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2743372800, while the sum is 74.

The spelling of 28994375364257 in words is "twenty-eight trillion, nine hundred ninety-four billion, three hundred seventy-five million, three hundred sixty-four thousand, two hundred fifty-seven".