7856961786 has 24 divisors (see below), whose sum is σ = 17344615860. Its totient is φ = 2569572096.

The previous prime is 7856961767. The next prime is 7856961787. The reversal of 7856961786 is 6871696587.

7856961786 is a `hidden beast` number, since 7 + 8 + 5 + 6 + 9 + 617 + 8 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7845530625 + 11431161 = 88575^2 + 3381^2 .

It is not an unprimeable number, because it can be changed into a prime (7856961787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4116951 + ... + 4118858.

Almost surely, 2^7856961786 is an apocalyptic number.

7856961786 is an abundant number, since it is smaller than the sum of its proper divisors (9487654074).

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

7856961786 is a wasteful number, since it uses less digits than its factorization.

7856961786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8235870 (or 8235867 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The square root of 7856961786 is about 88639.5046579120. The cubic root of 7856961786 is about 1988.0083932147.

The spelling of 7856961786 in words is "seven billion, eight hundred fifty-six million, nine hundred sixty-one thousand, seven hundred eighty-six".