6991648 has 36 divisors (see below), whose sum is σ = 14296338. Its totient is φ = 3363840.

The previous prime is 6991619. The next prime is 6991657. The reversal of 6991648 is 8461996.

It can be written as a sum of positive squares in 3 ways, for example, as 4717584 + 2274064 = 2172^2 + 1508^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95740 + ... + 95812.

Almost surely, 2^6991648 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 6991648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7148169).

6991648 is an abundant number, since it is smaller than the sum of its proper divisors (7304690).

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

6991648 is an equidigital number, since it uses as much as digits as its factorization.

6991648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 116 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 6991648 is about 2644.1724603361. The cubic root of 6991648 is about 191.2170079932.

The spelling of 6991648 in words is "six million, nine hundred ninety-one thousand, six hundred forty-eight".