1266878480 has 80 divisors (see below), whose sum is σ = 3377700480. Its totient is φ = 432884736.

The previous prime is 1266878429. The next prime is 1266878507. The reversal of 1266878480 is 848786621.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1266878480² = 3209962166174220800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168236 + ... + 175604.

It is an arithmetic number, because the mean of its divisors is an integer number (42221256).

Almost surely, 2^1266878480 is an apocalyptic number.

1266878480 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 1266878480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1688850240).

1266878480 is an abundant number, since it is smaller than the sum of its proper divisors (2110822000).

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

1266878480 is a wasteful number, since it uses less digits than its factorization.

1266878480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7696 (or 7690 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 50.

The square root of 1266878480 is about 35593.2364361546. The cubic root of 1266878480 is about 1082.0441623216.

The spelling of 1266878480 in words is "one billion, two hundred sixty-six million, eight hundred seventy-eight thousand, four hundred eighty".