644672024082 has 12 divisors (see below), whose sum is σ = 1396789385550. Its totient is φ = 214890674688.

The previous prime is 644672024081. The next prime is 644672024083. The reversal of 644672024082 is 280420276446.

It is an interprime number because it is at equal distance from previous prime (644672024081) and next prime (644672024083).

It can be written as a sum of positive squares in only one way, i.e., 432686368521 + 211985655561 = 657789^2 + 460419^2 .

It is not an unprimeable number, because it can be changed into a prime (644672024081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17907556207 + ... + 17907556242.

Almost surely, 2^644672024082 is an apocalyptic number.

644672024082 is an abundant number, since it is smaller than the sum of its proper divisors (752117361468).

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

644672024082 is a wasteful number, since it uses less digits than its factorization.

644672024082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35815112457 (or 35815112454 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 45.

The spelling of 644672024082 in words is "six hundred forty-four billion, six hundred seventy-two million, twenty-four thousand, eighty-two".