78327689887 has 2 divisors, whose sum is σ = 78327689888. Its totient is φ = 78327689886.

The previous prime is 78327689851. The next prime is 78327689903. The reversal of 78327689887 is 78898672387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78327689887 - 2²³ = 78319301279 is a prime.

It is a super-2 number, since 2×78327689887² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78327689827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39163844943 + 39163844944.

It is an arithmetic number, because the mean of its divisors is an integer number (39163844944).

Almost surely, 2^78327689887 is an apocalyptic number.

78327689887 is a deficient number, since it is larger than the sum of its proper divisors (1).

78327689887 is an equidigital number, since it uses as much as digits as its factorization.

78327689887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 455196672, while the sum is 73.

The spelling of 78327689887 in words is "seventy-eight billion, three hundred twenty-seven million, six hundred eighty-nine thousand, eight hundred eighty-seven".