78831283857 has 12 divisors (see below), whose sum is σ = 108857789040. Its totient is φ = 50741974192.

The previous prime is 78831283837. The next prime is 78831283877. The reversal of 78831283857 is 75838213887.

It is an interprime number because it is at equal distance from previous prime (78831283837) and next prime (78831283877).

It is a de Polignac number, because none of the positive numbers 2^k-78831283857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78831283857.

It is not an unprimeable number, because it can be changed into a prime (78831283837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15620007 + ... + 15625052.

It is an arithmetic number, because the mean of its divisors is an integer number (9071482420).

Almost surely, 2^78831283857 is an apocalyptic number.

It is an amenable number.

78831283857 is a deficient number, since it is larger than the sum of its proper divisors (30026505183).

78831283857 is a wasteful number, since it uses less digits than its factorization.

78831283857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31245120 (or 31245091 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 60.

The spelling of 78831283857 in words is "seventy-eight billion, eight hundred thirty-one million, two hundred eighty-three thousand, eight hundred fifty-seven".