7981648 has 20 divisors (see below), whose sum is σ = 15538068. Its totient is φ = 3971840.

The previous prime is 7981639. The next prime is 7981661. The reversal of 7981648 is 8461897.

It can be written as a sum of positive squares in 2 ways, for example, as 4981824 + 2999824 = 2232^2 + 1732^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2658 + ... + 4798.

Almost surely, 2^7981648 is an apocalyptic number.

It is an amenable number.

7981648 is a deficient number, since it is larger than the sum of its proper divisors (7556420).

7981648 is a wasteful number, since it uses less digits than its factorization.

7981648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382 (or 2376 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 7981648 is about 2825.1810561449. The cubic root of 7981648 is about 199.8469495744.

Subtracting 7981648 from its reverse (8461897), we obtain a square (480249 = 693²).

The spelling of 7981648 in words is "seven million, nine hundred eighty-one thousand, six hundred forty-eight".