78587243613 has 24 divisors (see below), whose sum is σ = 114495432480. Its totient is φ = 51939744480.

The previous prime is 78587243591. The next prime is 78587243639. The reversal of 78587243613 is 31634278587.

It is a happy number.

78587243613 is a `hidden beast` number, since 7 + 8 + 587 + 2 + 43 + 6 + 13 = 666.

It is not a de Polignac number, because 78587243613 - 2⁶ = 78587243549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78587243613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78587223613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1168695 + ... + 1234107.

It is an arithmetic number, because the mean of its divisors is an integer number (4770643020).

Almost surely, 2^78587243613 is an apocalyptic number.

It is an amenable number.

78587243613 is a deficient number, since it is larger than the sum of its proper divisors (35908188867).

78587243613 is a wasteful number, since it uses less digits than its factorization.

78587243613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66569 (or 66566 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The spelling of 78587243613 in words is "seventy-eight billion, five hundred eighty-seven million, two hundred forty-three thousand, six hundred thirteen".