7897717856 has 24 divisors (see below), whose sum is σ = 17769865680. Its totient is φ = 3384736128.

The previous prime is 7897717853. The next prime is 7897717889. The reversal of 7897717856 is 6587177987.

It is a junction number, because it is equal to n+sod(n) for n = 7897717792 and 7897717801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7897717853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17628611 + ... + 17629058.

It is an arithmetic number, because the mean of its divisors is an integer number (740411070).

Almost surely, 2^7897717856 is an apocalyptic number.

It is an amenable number.

7897717856 is an abundant number, since it is smaller than the sum of its proper divisors (9872147824).

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

7897717856 is a wasteful number, since it uses less digits than its factorization.

7897717856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35257686 (or 35257678 counting only the distinct ones).

The product of its digits is 41489280, while the sum is 65.

The square root of 7897717856 is about 88869.1051828474. The cubic root of 7897717856 is about 1991.4399026369.

The spelling of 7897717856 in words is "seven billion, eight hundred ninety-seven million, seven hundred seventeen thousand, eight hundred fifty-six".