1279204641880 has 128 divisors (see below), whose sum is σ = 3281247636480. Its totient is φ = 444680248320.

The previous prime is 1279204641857. The next prime is 1279204641887. The reversal of 1279204641880 is 881464029721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279204641887) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 169972 + ... + 1608508.

It is an arithmetic number, because the mean of its divisors is an integer number (25634747160).

Almost surely, 2^{1279204641880} is an apocalyptic number.

1279204641880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1279204641880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1640623818240).

1279204641880 is an abundant number, since it is smaller than the sum of its proper divisors (2002042994600).

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

1279204641880 is a wasteful number, since it uses less digits than its factorization.

1279204641880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438649 (or 1438645 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 52.

The spelling of 1279204641880 in words is "one trillion, two hundred seventy-nine billion, two hundred four million, six hundred forty-one thousand, eight hundred eighty".