1780720640672 has 48 divisors (see below), whose sum is σ = 3637069632000. Its totient is φ = 857309080320.

The previous prime is 1780720640659. The next prime is 1780720640687. The reversal of 1780720640672 is 2760460270871.

It is a super-3 number, since 3×1780720640672³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1780720640672.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4312847 + ... + 4707662.

It is an arithmetic number, because the mean of its divisors is an integer number (75772284000).

Almost surely, 2^{1780720640672} is an apocalyptic number.

It is an amenable number.

1780720640672 is an abundant number, since it is smaller than the sum of its proper divisors (1856348991328).

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

1780720640672 is a wasteful number, since it uses less digits than its factorization.

1780720640672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9020749 (or 9020741 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 1780720640672 in words is "one trillion, seven hundred eighty billion, seven hundred twenty million, six hundred forty thousand, six hundred seventy-two".