6440613 has 8 divisors (see below), whose sum is σ = 8749728. Its totient is φ = 4212624.

The previous prime is 6440587. The next prime is 6440641. The reversal of 6440613 is 3160446.

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

It is not a de Polignac number, because 6440613 - 2⁶ = 6440549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440683) 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, 20095 + ... + 20412.

It is an arithmetic number, because the mean of its divisors is an integer number (1093716).

Almost surely, 2^6440613 is an apocalyptic number.

It is an amenable number.

6440613 is a deficient number, since it is larger than the sum of its proper divisors (2309115).

6440613 is a wasteful number, since it uses less digits than its factorization.

6440613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40563.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 6440613 is about 2537.8362831357. The cubic root of 6440613 is about 186.0554523067.

The spelling of 6440613 in words is "six million, four hundred forty thousand, six hundred thirteen".