7878791 has 2 divisors, whose sum is σ = 7878792. Its totient is φ = 7878790.

The previous prime is 7878763. The next prime is 7878797. The reversal of 7878791 is 1978787.

7878791 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7878791 - 2²² = 3684487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7878797) 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, 3939395 + 3939396.

It is an arithmetic number, because the mean of its divisors is an integer number (3939396).

Almost surely, 2^7878791 is an apocalyptic number.

7878791 is a deficient number, since it is larger than the sum of its proper divisors (1).

7878791 is an equidigital number, since it uses as much as digits as its factorization.

7878791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 197568, while the sum is 47.

The square root of 7878791 is about 2806.9184170545. The cubic root of 7878791 is about 198.9847803651.

It can be divided in two parts, 78787 and 91, that multiplied together give a palindrome (7169617).

The spelling of 7878791 in words is "seven million, eight hundred seventy-eight thousand, seven hundred ninety-one".