6640870 has 16 divisors (see below), whose sum is σ = 12017808. Its totient is φ = 2642080.

The previous prime is 6640849. The next prime is 6640889. The reversal of 6640870 is 780466.

It is a super-4 number, since 4×6640870⁴ (a number of 28 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285 + ... + 3655.

It is an arithmetic number, because the mean of its divisors is an integer number (751113).

Almost surely, 2^6640870 is an apocalyptic number.

6640870 is a deficient number, since it is larger than the sum of its proper divisors (5376938).

6640870 is a wasteful number, since it uses less digits than its factorization.

6640870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3575.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 6640870 is about 2576.9885525551. The cubic root of 6640870 is about 187.9641360591.

The spelling of 6640870 in words is "six million, six hundred forty thousand, eight hundred seventy".