78543887 has 2 divisors, whose sum is σ = 78543888. Its totient is φ = 78543886.

The previous prime is 78543877. The next prime is 78543889. The reversal of 78543887 is 78834587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78543887 - 2²⁰ = 77495311 is a prime.

Together with 78543889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78543889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39271943 + 39271944.

It is an arithmetic number, because the mean of its divisors is an integer number (39271944).

Almost surely, 2^78543887 is an apocalyptic number.

78543887 is a deficient number, since it is larger than the sum of its proper divisors (1).

78543887 is an equidigital number, since it uses as much as digits as its factorization.

78543887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1505280, while the sum is 50.

The square root of 78543887 is about 8862.4989139633. The cubic root of 78543887 is about 428.2566643331.

The spelling of 78543887 in words is "seventy-eight million, five hundred forty-three thousand, eight hundred eighty-seven".