644052339270 has 96 divisors (see below), whose sum is σ = 1709423089920. Its totient is φ = 168193739520.

The previous prime is 644052339247. The next prime is 644052339289. The reversal of 644052339270 is 72933250446.

644052339270 is a `hidden beast` number, since 6 + 4 + 40 + 5 + 2 + 339 + 270 = 666.

It is a super-3 number, since 3×644052339270³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1001067 + ... + 1513353.

It is an arithmetic number, because the mean of its divisors is an integer number (17806490520).

Almost surely, 2^644052339270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644052339270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (854711544960).

644052339270 is an abundant number, since it is smaller than the sum of its proper divisors (1065370750650).

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

644052339270 is a wasteful number, since it uses less digits than its factorization.

644052339270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512590 (or 512587 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 45.

The spelling of 644052339270 in words is "six hundred forty-four billion, fifty-two million, three hundred thirty-nine thousand, two hundred seventy".