644116774 has 32 divisors (see below), whose sum is σ = 1176961536. Its totient is φ = 258076800.

The previous prime is 644116727. The next prime is 644116789. The reversal of 644116774 is 477611446.

It is a congruent 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, 26977 + ... + 44899.

It is an arithmetic number, because the mean of its divisors is an integer number (36780048).

Almost surely, 2^644116774 is an apocalyptic number.

644116774 is a deficient number, since it is larger than the sum of its proper divisors (532844762).

644116774 is a wasteful number, since it uses less digits than its factorization.

644116774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18100.

The product of its digits is 112896, while the sum is 40.

The square root of 644116774 is about 25379.4557467255. The cubic root of 644116774 is about 863.6177033470.

The spelling of 644116774 in words is "six hundred forty-four million, one hundred sixteen thousand, seven hundred seventy-four".