6408661 has 12 divisors (see below), whose sum is σ = 7697280. Its totient is φ = 5314680.

The previous prime is 6408653. The next prime is 6408691. The reversal of 6408661 is 1668046.

It is not a de Polignac number, because 6408661 - 2³ = 6408653 is a prime.

It is a super-3 number, since 3×6408661³ (a number of 21 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6408631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 591 + ... + 3628.

It is an arithmetic number, because the mean of its divisors is an integer number (641440).

Almost surely, 2^6408661 is an apocalyptic number.

It is an amenable number.

6408661 is a deficient number, since it is larger than the sum of its proper divisors (1288619).

6408661 is a wasteful number, since it uses less digits than its factorization.

6408661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264 (or 4257 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 6408661 is about 2531.5333298221. The cubic root of 6408661 is about 185.7472672616.

The spelling of 6408661 in words is "six million, four hundred eight thousand, six hundred sixty-one".