28394001693887 has 2 divisors, whose sum is σ = 28394001693888. Its totient is φ = 28394001693886.

The previous prime is 28394001693857. The next prime is 28394001693907. The reversal of 28394001693887 is 78839610049382.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28394001693887 - 2¹⁰ = 28394001692863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28394001693857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14197000846943 + 14197000846944.

It is an arithmetic number, because the mean of its divisors is an integer number (14197000846944).

Almost surely, 2^{28394001693887} is an apocalyptic number.

28394001693887 is a deficient number, since it is larger than the sum of its proper divisors (1).

28394001693887 is an equidigital number, since it uses as much as digits as its factorization.

28394001693887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125411328, while the sum is 68.

The spelling of 28394001693887 in words is "twenty-eight trillion, three hundred ninety-four billion, one million, six hundred ninety-three thousand, eight hundred eighty-seven".