1276663680 has 192 divisors, whose sum is σ = 4572313200. Its totient is φ = 340402176.

The previous prime is 1276663667. The next prime is 1276663697. The reversal of 1276663680 is 863666721.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×1276663680² = 3259740303662284800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151416 + ... + 159624.

Almost surely, 2^1276663680 is an apocalyptic number.

1276663680 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 1276663680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2286156600).

1276663680 is an abundant number, since it is smaller than the sum of its proper divisors (3295649520).

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

1276663680 is an frugal number, since it uses more digits than its factorization.

1276663680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8243 (or 8219 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 1276663680 is about 35730.4307278824. The cubic root of 1276663680 is about 1084.8228752322.

The spelling of 1276663680 in words is "one billion, two hundred seventy-six million, six hundred sixty-three thousand, six hundred eighty".