644834982 has 32 divisors (see below), whose sum is σ = 1407893760. Its totient is φ = 195268320.

The previous prime is 644834963. The next prime is 644834989. The reversal of 644834982 is 289438446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644834989) 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 15 ways as a sum of consecutive naturals, for example, 133119 + ... + 137877.

It is an arithmetic number, because the mean of its divisors is an integer number (43996680).

Almost surely, 2^644834982 is an apocalyptic number.

644834982 is an abundant number, since it is smaller than the sum of its proper divisors (763058778).

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

644834982 is a wasteful number, since it uses less digits than its factorization.

644834982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6828.

The product of its digits is 1327104, while the sum is 48.

The square root of 644834982 is about 25393.6012018776. The cubic root of 644834982 is about 863.9385699852.

It can be divided in two parts, 644834 and 982, that added together give a triangular number (645816 = T₁₁₃₆).

The spelling of 644834982 in words is "six hundred forty-four million, eight hundred thirty-four thousand, nine hundred eighty-two".