644284864046 has 8 divisors (see below), whose sum is σ = 966491457744. Its totient is φ = 322121044800.

The previous prime is 644284864043. The next prime is 644284864049. The reversal of 644284864046 is 640468482446.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (644284864043) and next prime (644284864049).

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

It is a super-3 number, since 3×644284864046³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 644284863982 and 644284864000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644284864043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10655930 + ... + 10716221.

It is an arithmetic number, because the mean of its divisors is an integer number (120811432218).

Almost surely, 2^644284864046 is an apocalyptic number.

644284864046 is a deficient number, since it is larger than the sum of its proper divisors (322206593698).

644284864046 is a wasteful number, since it uses less digits than its factorization.

644284864046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21387226.

The product of its (nonzero) digits is 28311552, while the sum is 56.

The spelling of 644284864046 in words is "six hundred forty-four billion, two hundred eighty-four million, eight hundred sixty-four thousand, forty-six".