6648981 has 8 divisors (see below), whose sum is σ = 8889024. Its totient is φ = 4420800.

The previous prime is 6648979. The next prime is 6648991. The reversal of 6648981 is 1898466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6648981 - 2¹ = 6648979 is a prime.

It is a super-3 number, since 3×6648981³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6648991) 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, 1561 + ... + 3966.

It is an arithmetic number, because the mean of its divisors is an integer number (1111128).

Almost surely, 2^6648981 is an apocalyptic number.

It is an amenable number.

6648981 is a deficient number, since it is larger than the sum of its proper divisors (2240043).

6648981 is a wasteful number, since it uses less digits than its factorization.

6648981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5931.

The product of its digits is 82944, while the sum is 42.

The square root of 6648981 is about 2578.5618084506. The cubic root of 6648981 is about 188.0406298937.

The spelling of 6648981 in words is "six million, six hundred forty-eight thousand, nine hundred eighty-one".