6641890 has 16 divisors (see below), whose sum is σ = 11984760. Its totient is φ = 2650240.

The previous prime is 6641867. The next prime is 6641891. The reversal of 6641890 is 981466.

It can be written as a sum of positive squares in 4 ways, for example, as 5793649 + 848241 = 2407^2 + 921^2 .

It is a super-2 number, since 2×6641890² = 88229405544200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6641891) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7680 + ... + 8500.

Almost surely, 2^6641890 is an apocalyptic number.

6641890 is a deficient number, since it is larger than the sum of its proper divisors (5342870).

6641890 is a wasteful number, since it uses less digits than its factorization.

6641890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 6641890 is about 2577.1864503757. The cubic root of 6641890 is about 187.9737589751.

The spelling of 6641890 in words is "six million, six hundred forty-one thousand, eight hundred ninety".