644054474 has 8 divisors (see below), whose sum is σ = 1104093408. Its totient is φ = 276023340.

The previous prime is 644054471. The next prime is 644054479. The reversal of 644054474 is 474450446.

It is a happy number.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (644054471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23001932 + ... + 23001959.

It is an arithmetic number, because the mean of its divisors is an integer number (138011676).

Almost surely, 2^644054474 is an apocalyptic number.

644054474 is a deficient number, since it is larger than the sum of its proper divisors (460038934).

644054474 is a wasteful number, since it uses less digits than its factorization.

644054474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46003900.

The product of its (nonzero) digits is 215040, while the sum is 38.

The square root of 644054474 is about 25378.2283463602. The cubic root of 644054474 is about 863.5898589561.

The spelling of 644054474 in words is "six hundred forty-four million, fifty-four thousand, four hundred seventy-four".