6662405 has 8 divisors (see below), whose sum is σ = 8211192. Its totient is φ = 5185728.

The previous prime is 6662401. The next prime is 6662417. The reversal of 6662405 is 5042666.

It can be written as a sum of positive squares in 4 ways, for example, as 1635841 + 5026564 = 1279^2 + 2242^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6662405 - 2² = 6662401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6662401) 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, 17822 + ... + 18191.

It is an arithmetic number, because the mean of its divisors is an integer number (1026399).

Almost surely, 2^6662405 is an apocalyptic number.

It is an amenable number.

6662405 is a deficient number, since it is larger than the sum of its proper divisors (1548787).

6662405 is a wasteful number, since it uses less digits than its factorization.

6662405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36055.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 6662405 is about 2581.1634973399. The cubic root of 6662405 is about 188.1670934090.

The spelling of 6662405 in words is "six million, six hundred sixty-two thousand, four hundred five".