6291666 has 48 divisors (see below), whose sum is σ = 14952600. Its totient is φ = 1903104.

The previous prime is 6291653. The next prime is 6291689. The reversal of 6291666 is 6661926.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5157441 + 1134225 = 2271^2 + 1065^2 .

It is a super-2 number, since 2×6291666² = 79170122111112, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 6291666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8520 + ... + 9228.

Almost surely, 2^6291666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6291666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7476300).

6291666 is an abundant number, since it is smaller than the sum of its proper divisors (8660934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6291666 is a wasteful number, since it uses less digits than its factorization.

6291666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763 (or 760 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 6291666 is about 2508.3193576576. The cubic root of 6291666 is about 184.6099989615.

The spelling of 6291666 in words is "six million, two hundred ninety-one thousand, six hundred sixty-six".