78807643 has 2 divisors, whose sum is σ = 78807644. Its totient is φ = 78807642.

The previous prime is 78807629. The next prime is 78807671. The reversal of 78807643 is 34670887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78807643 - 2¹⁷ = 78676571 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78807643.

It is not a weakly prime, because it can be changed into another prime (78807623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39403821 + 39403822.

It is an arithmetic number, because the mean of its divisors is an integer number (39403822).

Almost surely, 2^78807643 is an apocalyptic number.

78807643 is a deficient number, since it is larger than the sum of its proper divisors (1).

78807643 is an equidigital number, since it uses as much as digits as its factorization.

78807643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 78807643 is about 8877.3668956510. The cubic root of 78807643 is about 428.7355009306.

The spelling of 78807643 in words is "seventy-eight million, eight hundred seven thousand, six hundred forty-three".