868428756872 has 16 divisors (see below), whose sum is σ = 1668018649500. Its totient is φ = 423623783680.

The previous prime is 868428756859. The next prime is 868428756941. The reversal of 868428756872 is 278657824868.

It can be written as a sum of positive squares in 2 ways, for example, as 803665632676 + 64763124196 = 896474^2 + 254486^2 .

It is a super-3 number, since 3×868428756872³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 868428756796 and 868428756805.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1323823997 + ... + 1323824652.

Almost surely, 2^868428756872 is an apocalyptic number.

868428756872 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

868428756872 is a deficient number, since it is larger than the sum of its proper divisors (799589892628).

868428756872 is a wasteful number, since it uses less digits than its factorization.

868428756872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647648696 (or 2647648692 counting only the distinct ones).

The product of its digits is 578027520, while the sum is 71.

The spelling of 868428756872 in words is "eight hundred sixty-eight billion, four hundred twenty-eight million, seven hundred fifty-six thousand, eight hundred seventy-two".