78992887 has 2 divisors, whose sum is σ = 78992888. Its totient is φ = 78992886.

The previous prime is 78992873. The next prime is 78992909. The reversal of 78992887 is 78829987.

It is a weak prime.

It is an emirp because it is prime and its reverse (78829987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78992887 - 2¹¹ = 78990839 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78992827) 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, 39496443 + 39496444.

It is an arithmetic number, because the mean of its divisors is an integer number (39496444).

Almost surely, 2^78992887 is an apocalyptic number.

78992887 is a deficient number, since it is larger than the sum of its proper divisors (1).

78992887 is an equidigital number, since it uses as much as digits as its factorization.

78992887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 58.

The square root of 78992887 is about 8887.7942707963. The cubic root of 78992887 is about 429.0711643634.

The spelling of 78992887 in words is "seventy-eight million, nine hundred ninety-two thousand, eight hundred eighty-seven".