78858851 has 2 divisors, whose sum is σ = 78858852. Its totient is φ = 78858850.

The previous prime is 78858841. The next prime is 78858931. The reversal of 78858851 is 15885887.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (15885887) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78858851 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78858851.

It is not a weakly prime, because it can be changed into another prime (78858811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39429425 + 39429426.

It is an arithmetic number, because the mean of its divisors is an integer number (39429426).

Almost surely, 2^78858851 is an apocalyptic number.

78858851 is a deficient number, since it is larger than the sum of its proper divisors (1).

78858851 is an equidigital number, since it uses as much as digits as its factorization.

78858851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 716800, while the sum is 50.

The square root of 78858851 is about 8880.2506158329. The cubic root of 78858851 is about 428.8283427462.

The spelling of 78858851 in words is "seventy-eight million, eight hundred fifty-eight thousand, eight hundred fifty-one".