1644272885280 has 48 divisors (see below), whose sum is σ = 5179459590144. Its totient is φ = 438472769280.

The previous prime is 1644272885251. The next prime is 1644272885303. The reversal of 1644272885280 is 825882724461.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-3 number, since 3×1644272885280³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1644272885280.

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, 1712783776 + ... + 1712784735.

It is an arithmetic number, because the mean of its divisors is an integer number (107905408128).

Almost surely, 2^{1644272885280} is an apocalyptic number.

1644272885280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1644272885280 is an abundant number, since it is smaller than the sum of its proper divisors (3535186704864).

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

1644272885280 is a wasteful number, since it uses less digits than its factorization.

1644272885280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3425568529 (or 3425568521 counting only the distinct ones).

The product of its (nonzero) digits is 13762560, while the sum is 57.

The spelling of 1644272885280 in words is "one trillion, six hundred forty-four billion, two hundred seventy-two million, eight hundred eighty-five thousand, two hundred eighty".