644965082 has 8 divisors (see below), whose sum is σ = 971302752. Its totient is φ = 321197500.

The previous prime is 644965073. The next prime is 644965121. The reversal of 644965082 is 280569446.

644965082 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641894 + ... + 642897.

It is an arithmetic number, because the mean of its divisors is an integer number (121412844).

Almost surely, 2^644965082 is an apocalyptic number.

644965082 is a deficient number, since it is larger than the sum of its proper divisors (326337670).

644965082 is a wasteful number, since it uses less digits than its factorization.

644965082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285044.

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 644965082 is about 25396.1627416427. The cubic root of 644965082 is about 863.9966679755.

The spelling of 644965082 in words is "six hundred forty-four million, nine hundred sixty-five thousand, eighty-two".