78996787 has 2 divisors, whose sum is σ = 78996788. Its totient is φ = 78996786.

The previous prime is 78996781. The next prime is 78996821. The reversal of 78996787 is 78769987.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78996787 - 2²³ = 70608179 is a prime.

It is not a weakly prime, because it can be changed into another prime (78996781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39498393 + 39498394.

It is an arithmetic number, because the mean of its divisors is an integer number (39498394).

Almost surely, 2^78996787 is an apocalyptic number.

78996787 is a deficient number, since it is larger than the sum of its proper divisors (1).

78996787 is an equidigital number, since it uses as much as digits as its factorization.

78996787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10668672, while the sum is 61.

The square root of 78996787 is about 8888.0136701065. The cubic root of 78996787 is about 429.0782255477.

The spelling of 78996787 in words is "seventy-eight million, nine hundred ninety-six thousand, seven hundred eighty-seven".