6991887952 has 40 divisors (see below), whose sum is σ = 15516028736. Its totient is φ = 2989944576.

The previous prime is 6991887911. The next prime is 6991887953. The reversal of 6991887952 is 2597881996.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991887953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17118 + ... + 119485.

Almost surely, 2^6991887952 is an apocalyptic number.

It is an amenable number.

6991887952 is an abundant number, since it is smaller than the sum of its proper divisors (8524140784).

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

6991887952 is a wasteful number, since it uses less digits than its factorization.

6991887952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137075 (or 137069 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 64.

The square root of 6991887952 is about 83617.5098409418. The cubic root of 6991887952 is about 1912.1919547832.

The spelling of 6991887952 in words is "six billion, nine hundred ninety-one million, eight hundred eighty-seven thousand, nine hundred fifty-two".