1266247880 has 64 divisors (see below), whose sum is σ = 2955279600. Its totient is φ = 487710720.

The previous prime is 1266247859. The next prime is 1266247891. The reversal of 1266247880 is 887426621.

It can be written as a sum of positive squares in 8 ways, for example, as 20016676 + 1246231204 = 4474^2 + 35302^2 .

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, 501020 + ... + 503540.

Almost surely, 2^1266247880 is an apocalyptic number.

1266247880 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 1266247880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1477639800).

1266247880 is an abundant number, since it is smaller than the sum of its proper divisors (1689031720).

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

1266247880 is a wasteful number, since it uses less digits than its factorization.

1266247880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2994 (or 2990 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 1266247880 is about 35584.3769089751. The cubic root of 1266247880 is about 1081.8646001657.

The spelling of 1266247880 in words is "one billion, two hundred sixty-six million, two hundred forty-seven thousand, eight hundred eighty".