6991489328 has 20 divisors (see below), whose sum is σ = 13569105480. Its totient is φ = 3489784704.

The previous prime is 6991489301. The next prime is 6991489333. The reversal of 6991489328 is 8239841996.

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, 362813 + ... + 381596.

It is an arithmetic number, because the mean of its divisors is an integer number (678455274).

Almost surely, 2^6991489328 is an apocalyptic number.

It is an amenable number.

6991489328 is a deficient number, since it is larger than the sum of its proper divisors (6577616152).

6991489328 is a wasteful number, since it uses less digits than its factorization.

6991489328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745004 (or 744998 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 59.

The square root of 6991489328 is about 83615.1261913776. The cubic root of 6991489328 is about 1912.1556145702.

The spelling of 6991489328 in words is "six billion, nine hundred ninety-one million, four hundred eighty-nine thousand, three hundred twenty-eight".