644152022 has 8 divisors (see below), whose sum is σ = 1017082200. Its totient is φ = 305124624.

The previous prime is 644151941. The next prime is 644152027. The reversal of 644152022 is 220251446.

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

It is a junction number, because it is equal to n+sod(n) for n = 644151982 and 644152000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644152027) 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 3 ways as a sum of consecutive naturals, for example, 8475647 + ... + 8475722.

It is an arithmetic number, because the mean of its divisors is an integer number (127135275).

Almost surely, 2^644152022 is an apocalyptic number.

644152022 is a deficient number, since it is larger than the sum of its proper divisors (372930178).

644152022 is a wasteful number, since it uses less digits than its factorization.

644152022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16951390.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 644152022 is about 25380.1501571602. The cubic root of 644152022 is about 863.6334563092.

The spelling of 644152022 in words is "six hundred forty-four million, one hundred fifty-two thousand, twenty-two".