644835674 has 8 divisors (see below), whose sum is σ = 1105432608. Its totient is φ = 276358140.

The previous prime is 644835647. The next prime is 644835731. The reversal of 644835674 is 476538446.

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

It is an unprimeable number.

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, 23029832 + ... + 23029859.

It is an arithmetic number, because the mean of its divisors is an integer number (138179076).

Almost surely, 2^644835674 is an apocalyptic number.

644835674 is a deficient number, since it is larger than the sum of its proper divisors (460596934).

644835674 is a wasteful number, since it uses less digits than its factorization.

644835674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46059700.

The product of its digits is 1935360, while the sum is 47.

The square root of 644835674 is about 25393.6148273537. The cubic root of 644835674 is about 863.9388790282.

The spelling of 644835674 in words is "six hundred forty-four million, eight hundred thirty-five thousand, six hundred seventy-four".