7142857142856 has 128 divisors (see below), whose sum is σ = 18900742348800. Its totient is φ = 2243195838720.

The previous prime is 7142857142777. The next prime is 7142857142857. The reversal of 7142857142856 is 6582417582417.

It is a self number, because there is not a number n which added to its sum of digits gives 7142857142856.

It is not an unprimeable number, because it can be changed into a prime (7142857142857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379990450 + ... + 380009246.

It is an arithmetic number, because the mean of its divisors is an integer number (147662049600).

Almost surely, 2^{7142857142856} is an apocalyptic number.

7142857142856 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7142857142856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9450371174400).

7142857142856 is an abundant number, since it is smaller than the sum of its proper divisors (11757885205944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7142857142856 is a wasteful number, since it uses less digits than its factorization.

7142857142856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23379 (or 23375 counting only the distinct ones).

The product of its digits is 30105600, while the sum is 60.

The spelling of 7142857142856 in words is "seven trillion, one hundred forty-two billion, eight hundred fifty-seven million, one hundred forty-two thousand, eight hundred fifty-six".