6646431 has 32 divisors (see below), whose sum is σ = 10229760. Its totient is φ = 3801600.

The previous prime is 6646429. The next prime is 6646477. The reversal of 6646431 is 1346466.

It is not a de Polignac number, because 6646431 - 2¹ = 6646429 is a prime.

It is a super-2 number, since 2×6646431² = 88350090075522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74635 + ... + 74723.

It is an arithmetic number, because the mean of its divisors is an integer number (319680).

Almost surely, 2^6646431 is an apocalyptic number.

6646431 is a deficient number, since it is larger than the sum of its proper divisors (3583329).

6646431 is a wasteful number, since it uses less digits than its factorization.

6646431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207.

The product of its digits is 10368, while the sum is 30.

The square root of 6646431 is about 2578.0672993543. The cubic root of 6646431 is about 188.0165878679.

The spelling of 6646431 in words is "six million, six hundred forty-six thousand, four hundred thirty-one".