7971739136 has 40 divisors (see below), whose sum is σ = 16152318864. Its totient is φ = 3929712640.

The previous prime is 7971739129. The next prime is 7971739159. The reversal of 7971739136 is 6319371797.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73295 + ... + 145998.

Almost surely, 2^7971739136 is an apocalyptic number.

It is an amenable number.

7971739136 is an abundant number, since it is smaller than the sum of its proper divisors (8180579728).

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

7971739136 is an equidigital number, since it uses as much as digits as its factorization.

7971739136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219382 (or 219366 counting only the distinct ones).

The product of its digits is 1500282, while the sum is 53.

The square root of 7971739136 is about 89284.5962974577. The cubic root of 7971739136 is about 1997.6421493626.

The spelling of 7971739136 in words is "seven billion, nine hundred seventy-one million, seven hundred thirty-nine thousand, one hundred thirty-six".