5666640 has 80 divisors (see below), whose sum is σ = 20082048. Its totient is φ = 1294848.

The previous prime is 5666623. The next prime is 5666641. The reversal of 5666640 is 466665.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×5666640² = 64221617779200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5666641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7 + ... + 3366.

Almost surely, 2^5666640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5666640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10041024).

5666640 is an abundant number, since it is smaller than the sum of its proper divisors (14415408).

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

5666640 is a wasteful number, since it uses less digits than its factorization.

5666640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396 (or 3390 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 5666640 is about 2380.4705417207. The cubic root of 5666640 is about 178.2824283817.

The spelling of 5666640 in words is "five million, six hundred sixty-six thousand, six hundred forty".