78596891 has 2 divisors, whose sum is σ = 78596892. Its totient is φ = 78596890.

The previous prime is 78596857. The next prime is 78596923. The reversal of 78596891 is 19869587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78596891 - 2¹⁸ = 78334747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78596801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39298445 + 39298446.

It is an arithmetic number, because the mean of its divisors is an integer number (39298446).

Almost surely, 2^78596891 is an apocalyptic number.

78596891 is a deficient number, since it is larger than the sum of its proper divisors (1).

78596891 is an equidigital number, since it uses as much as digits as its factorization.

78596891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 53.

The square root of 78596891 is about 8865.4887626120. The cubic root of 78596891 is about 428.3529765687.

The spelling of 78596891 in words is "seventy-eight million, five hundred ninety-six thousand, eight hundred ninety-one".