6640071 has 8 divisors (see below), whose sum is σ = 8878080. Its totient is φ = 4414392.

The previous prime is 6640069. The next prime is 6640079. The reversal of 6640071 is 1700466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6640071 - 2¹ = 6640069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1741 + ... + 4038.

It is an arithmetic number, because the mean of its divisors is an integer number (1109760).

Almost surely, 2^6640071 is an apocalyptic number.

6640071 is a deficient number, since it is larger than the sum of its proper divisors (2238009).

6640071 is a wasteful number, since it uses less digits than its factorization.

6640071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6165.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 6640071 is about 2576.8335219800. The cubic root of 6640071 is about 187.9565974199.

The spelling of 6640071 in words is "six million, six hundred forty thousand, seventy-one".