6464638 has 4 divisors (see below), whose sum is σ = 9696960. Its totient is φ = 3232318.

The previous prime is 6464611. The next prime is 6464639. The reversal of 6464638 is 8364646.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 6464597 and 6464606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6464639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1616158 + ... + 1616161.

It is an arithmetic number, because the mean of its divisors is an integer number (2424240).

Almost surely, 2^6464638 is an apocalyptic number.

6464638 is a deficient number, since it is larger than the sum of its proper divisors (3232322).

6464638 is a wasteful number, since it uses less digits than its factorization.

6464638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232321.

The product of its digits is 82944, while the sum is 37.

The square root of 6464638 is about 2542.5652400676. The cubic root of 6464638 is about 186.2865087658.

The spelling of 6464638 in words is "six million, four hundred sixty-four thousand, six hundred thirty-eight".