78790687 has 2 divisors, whose sum is σ = 78790688. Its totient is φ = 78790686.

The previous prime is 78790669. The next prime is 78790693. The reversal of 78790687 is 78609787.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (78609787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78790687 - 2⁷ = 78790559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78790637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39395343 + 39395344.

It is an arithmetic number, because the mean of its divisors is an integer number (39395344).

Almost surely, 2^78790687 is an apocalyptic number.

78790687 is a deficient number, since it is larger than the sum of its proper divisors (1).

78790687 is an equidigital number, since it uses as much as digits as its factorization.

78790687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 78790687 is about 8876.4118313652. The cubic root of 78790687 is about 428.7047502728.

The spelling of 78790687 in words is "seventy-eight million, seven hundred ninety thousand, six hundred eighty-seven".