6664690 has 16 divisors (see below), whose sum is σ = 12384000. Its totient is φ = 2579760.

The previous prime is 6664667. The next prime is 6664711. The reversal of 6664690 is 964666.

It is a super-2 number, since 2×6664690² = 88836185592200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10440 + ... + 11059.

It is an arithmetic number, because the mean of its divisors is an integer number (774000).

Almost surely, 2^6664690 is an apocalyptic number.

6664690 is a deficient number, since it is larger than the sum of its proper divisors (5719310).

6664690 is a wasteful number, since it uses less digits than its factorization.

6664690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21537.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 6664690 is about 2581.6060892398. The cubic root of 6664690 is about 188.1886027920.

It can be divided in two parts, 666 and 4690, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 6664690 in words is "six million, six hundred sixty-four thousand, six hundred ninety".