1276489728000 has 768 divisors, whose sum is σ = 4754808564480. Its totient is φ = 329121792000.

The previous prime is 1276489727999. The next prime is 1276489728001. The reversal of 1276489728000 is 8279846721.

It is a happy number.

1276489728000 is a `hidden beast` number, since 1 + 276 + 4 + 8 + 97 + 280 + 0 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1276489727999) and next prime (1276489728001).

It is a tau number, because it is divible by the number of its divisors (768).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276489728001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1142783442 + ... + 1142784558.

It is an arithmetic number, because the mean of its divisors is an integer number (6191156985).

Almost surely, 2^{1276489728000} is an apocalyptic number.

1276489728000 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 1276489728000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2377404282240).

1276489728000 is an abundant number, since it is smaller than the sum of its proper divisors (3478318836480).

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

1276489728000 is an equidigital number, since it uses as much as digits as its factorization.

1276489728000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 1276489728000 in words is "one trillion, two hundred seventy-six billion, four hundred eighty-nine million, seven hundred twenty-eight thousand".