7947391716 has 36 divisors (see below), whose sum is σ = 21915535824. Its totient is φ = 2408300400.

The previous prime is 7947391703. The next prime is 7947391717. The reversal of 7947391716 is 6171937497.

7947391716 is a `hidden beast` number, since 79 + 473 + 91 + 7 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×7947391716² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7947391717) 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, 10034190 + ... + 10034981.

It is an arithmetic number, because the mean of its divisors is an integer number (608764884).

Almost surely, 2^7947391716 is an apocalyptic number.

It is an amenable number.

7947391716 is an abundant number, since it is smaller than the sum of its proper divisors (13968144108).

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

7947391716 is a wasteful number, since it uses less digits than its factorization.

7947391716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20069192 (or 20069187 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 54.

The square root of 7947391716 is about 89148.1447703765. The cubic root of 7947391716 is about 1995.6063312388.

The spelling of 7947391716 in words is "seven billion, nine hundred forty-seven million, three hundred ninety-one thousand, seven hundred sixteen".