1279420730880 has 320 divisors, whose sum is σ = 4325099175936. Its totient is φ = 322117632000.

The previous prime is 1279420730879. The next prime is 1279420730893. The reversal of 1279420730880 is 880370249721.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 9695745 + ... + 9826815.

Almost surely, 2^{1279420730880} is an apocalyptic number.

1279420730880 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 1279420730880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2162549587968).

1279420730880 is an abundant number, since it is smaller than the sum of its proper divisors (3045678445056).

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

1279420730880 is a wasteful number, since it uses less digits than its factorization.

1279420730880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131169 (or 131153 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 51.

The spelling of 1279420730880 in words is "one trillion, two hundred seventy-nine billion, four hundred twenty million, seven hundred thirty thousand, eight hundred eighty".