644010546 has 32 divisors (see below), whose sum is σ = 1299912768. Its totient is φ = 212696640.

The previous prime is 644010539. The next prime is 644010551. The reversal of 644010546 is 645010446.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433521 + ... + 435003.

It is an arithmetic number, because the mean of its divisors is an integer number (40622274).

Almost surely, 2^644010546 is an apocalyptic number.

644010546 is an abundant number, since it is smaller than the sum of its proper divisors (655902222).

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

644010546 is a wasteful number, since it uses less digits than its factorization.

644010546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 644010546 is about 25377.3628653570. The cubic root of 644010546 is about 863.5702246760.

The spelling of 644010546 in words is "six hundred forty-four million, ten thousand, five hundred forty-six".