6440722 has 8 divisors (see below), whose sum is σ = 10229436. Its totient is φ = 3030912.

The previous prime is 6440699. The next prime is 6440723. The reversal of 6440722 is 2270446.

It can be written as a sum of positive squares in 2 ways, for example, as 5377761 + 1062961 = 2319^2 + 1031^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6440723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94683 + ... + 94750.

Almost surely, 2^6440722 is an apocalyptic number.

6440722 is a deficient number, since it is larger than the sum of its proper divisors (3788714).

6440722 is a wasteful number, since it uses less digits than its factorization.

6440722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189452.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 6440722 is about 2537.8577580314. The cubic root of 6440722 is about 186.0565018926.

The spelling of 6440722 in words is "six million, four hundred forty thousand, seven hundred twenty-two".