6442604644 has 24 divisors (see below), whose sum is σ = 12899851328. Its totient is φ = 2757978720.

The previous prime is 6442604639. The next prime is 6442604647. The reversal of 6442604644 is 4464062446.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6442604597 and 6442604606.

It is not an unprimeable number, because it can be changed into a prime (6442604647) 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, 105567 + ... + 155014.

Almost surely, 2^6442604644 is an apocalyptic number.

It is an amenable number.

6442604644 is an abundant number, since it is smaller than the sum of its proper divisors (6457246684).

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

6442604644 is a wasteful number, since it uses less digits than its factorization.

6442604644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261475 (or 261473 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 40.

The square root of 6442604644 is about 80265.8373406769. The cubic root of 6442604644 is about 1860.7462843351.

The spelling of 6442604644 in words is "six billion, four hundred forty-two million, six hundred four thousand, six hundred forty-four".