7817406856 has 32 divisors (see below), whose sum is σ = 16845192000. Its totient is φ = 3331596096.

The previous prime is 7817406851. The next prime is 7817406859. The reversal of 7817406856 is 6586047187.

It is a super-2 number, since 2×7817406856² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7817406851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379911 + ... + 399958.

It is an arithmetic number, because the mean of its divisors is an integer number (526412250).

Almost surely, 2^7817406856 is an apocalyptic number.

It is an amenable number.

7817406856 is an abundant number, since it is smaller than the sum of its proper divisors (9027785144).

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

7817406856 is a wasteful number, since it uses less digits than its factorization.

7817406856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780061 (or 780057 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 52.

The square root of 7817406856 is about 88416.1006604566. The cubic root of 7817406856 is about 1984.6666492651. Note that the first 4 decimals are identical.

The spelling of 7817406856 in words is "seven billion, eight hundred seventeen million, four hundred six thousand, eight hundred fifty-six".