7991003960 has 64 divisors (see below), whose sum is σ = 18638644320. Its totient is φ = 3080885760.

The previous prime is 7991003959. The next prime is 7991004019. The reversal of 7991003960 is 693001997.

It is a happy number.

It is a super-2 number, since 2×7991003960² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133130 + ... + 183590.

Almost surely, 2^7991003960 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 7991003960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9319322160).

7991003960 is an abundant number, since it is smaller than the sum of its proper divisors (10647640360).

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

7991003960 is a wasteful number, since it uses less digits than its factorization.

7991003960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50616 (or 50612 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 7991003960 is about 89392.4155619480. The cubic root of 7991003960 is about 1999.2500488218.

The spelling of 7991003960 in words is "seven billion, nine hundred ninety-one million, three thousand, nine hundred sixty".