644216282 has 16 divisors (see below), whose sum is σ = 989796192. Its totient is φ = 314299440.

The previous prime is 644216249. The next prime is 644216297. The reversal of 644216282 is 282612446.

It is a super-3 number, since 3×644216282³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97508 + ... + 103904.

It is an arithmetic number, because the mean of its divisors is an integer number (61862262).

Almost surely, 2^644216282 is an apocalyptic number.

644216282 is a deficient number, since it is larger than the sum of its proper divisors (345579910).

644216282 is a wasteful number, since it uses less digits than its factorization.

644216282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7613.

The product of its digits is 36864, while the sum is 35.

The square root of 644216282 is about 25381.4160755463. The cubic root of 644216282 is about 863.6621737748.

The spelling of 644216282 in words is "six hundred forty-four million, two hundred sixteen thousand, two hundred eighty-two".