7897407856 has 60 divisors (see below), whose sum is σ = 16595113440. Its totient is φ = 3639168000.

The previous prime is 7897407841. The next prime is 7897407899. The reversal of 7897407856 is 6587047987.

It is a junction number, because it is equal to n+sod(n) for n = 7897407794 and 7897407803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2028760 + ... + 2032648.

It is an arithmetic number, because the mean of its divisors is an integer number (276585224).

Almost surely, 2^7897407856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7897407856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8297556720).

7897407856 is an abundant number, since it is smaller than the sum of its proper divisors (8697705584).

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

7897407856 is a wasteful number, since it uses less digits than its factorization.

7897407856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674 (or 4655 counting only the distinct ones).

The product of its (nonzero) digits is 23708160, while the sum is 61.

The square root of 7897407856 is about 88867.3610275449. The cubic root of 7897407856 is about 1991.4138463989.

The spelling of 7897407856 in words is "seven billion, eight hundred ninety-seven million, four hundred seven thousand, eight hundred fifty-six".