78587893 has 2 divisors, whose sum is σ = 78587894. Its totient is φ = 78587892.

The previous prime is 78587891. The next prime is 78587903. The reversal of 78587893 is 39878587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76160529 + 2427364 = 8727^2 + 1558^2 .

It is a cyclic number.

It is not a de Polignac number, because 78587893 - 2¹ = 78587891 is a prime.

Together with 78587891, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78587891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39293946 + 39293947.

It is an arithmetic number, because the mean of its divisors is an integer number (39293947).

Almost surely, 2^78587893 is an apocalyptic number.

It is an amenable number.

78587893 is a deficient number, since it is larger than the sum of its proper divisors (1).

78587893 is an equidigital number, since it uses as much as digits as its factorization.

78587893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 55.

The square root of 78587893 is about 8864.9812746559. The cubic root of 78587893 is about 428.3366295813.

It can be divided in two parts, 7858 and 7893, that added together give a palindrome (15751).

The spelling of 78587893 in words is "seventy-eight million, five hundred eighty-seven thousand, eight hundred ninety-three".