6991520920 has 32 divisors (see below), whose sum is σ = 15740334000. Its totient is φ = 2794935168.

The previous prime is 6991520903. The next prime is 6991520957. The reversal of 6991520920 is 290251996.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16522 + ... + 119398.

Almost surely, 2^6991520920 is an apocalyptic number.

It is an amenable number.

6991520920 is an abundant number, since it is smaller than the sum of its proper divisors (8748813080).

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

6991520920 is a wasteful number, since it uses less digits than its factorization.

6991520920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104587 (or 104583 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 6991520920 is about 83615.3151043515. The cubic root of 6991520920 is about 1912.1584946780.

The spelling of 6991520920 in words is "six billion, nine hundred ninety-one million, five hundred twenty thousand, nine hundred twenty".