644003612282 has 4 divisors (see below), whose sum is σ = 966005418426. Its totient is φ = 322001806140.

The previous prime is 644003612281. The next prime is 644003612333. The reversal of 644003612282 is 282216300446.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 492255188881 + 151748423401 = 701609^2 + 389549^2 .

It is not an unprimeable number, because it can be changed into a prime (644003612281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161000903069 + ... + 161000903072.

Almost surely, 2^644003612282 is an apocalyptic number.

644003612282 is a deficient number, since it is larger than the sum of its proper divisors (322001806144).

644003612282 is a wasteful number, since it uses less digits than its factorization.

644003612282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322001806143.

The product of its (nonzero) digits is 110592, while the sum is 38.

The spelling of 644003612282 in words is "six hundred forty-four billion, three million, six hundred twelve thousand, two hundred eighty-two".