78612887 has 2 divisors, whose sum is σ = 78612888. Its totient is φ = 78612886.

The previous prime is 78612851. The next prime is 78612889. The reversal of 78612887 is 78821687.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78612887 - 2¹² = 78608791 is a prime.

Together with 78612889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78612889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39306443 + 39306444.

It is an arithmetic number, because the mean of its divisors is an integer number (39306444).

Almost surely, 2^78612887 is an apocalyptic number.

78612887 is a deficient number, since it is larger than the sum of its proper divisors (1).

78612887 is an equidigital number, since it uses as much as digits as its factorization.

78612887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 301056, while the sum is 47.

The square root of 78612887 is about 8866.3908666379. The cubic root of 78612887 is about 428.3820339922.

The spelling of 78612887 in words is "seventy-eight million, six hundred twelve thousand, eight hundred eighty-seven".