87578121727 has 2 divisors, whose sum is σ = 87578121728. Its totient is φ = 87578121726.

The previous prime is 87578121691. The next prime is 87578121739. The reversal of 87578121727 is 72712187578.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87578121727 - 2¹⁵ = 87578088959 is a prime.

It is a super-3 number, since 3×87578121727³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87578124727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43789060863 + 43789060864.

It is an arithmetic number, because the mean of its divisors is an integer number (43789060864).

Almost surely, 2^87578121727 is an apocalyptic number.

87578121727 is a deficient number, since it is larger than the sum of its proper divisors (1).

87578121727 is an equidigital number, since it uses as much as digits as its factorization.

87578121727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3073280, while the sum is 55.

The spelling of 87578121727 in words is "eighty-seven billion, five hundred seventy-eight million, one hundred twenty-one thousand, seven hundred twenty-seven".