1266878400 has 84 divisors (see below), whose sum is σ = 4156432632. Its totient is φ = 337832960.

The previous prime is 1266878399. The next prime is 1266878419. The reversal of 1266878400 is 48786621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127167 + ... + 136766.

Almost surely, 2^1266878400 is an apocalyptic number.

1266878400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266878400 is an abundant number, since it is smaller than the sum of its proper divisors (2889554232).

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

1266878400 is a wasteful number, since it uses less digits than its factorization.

1266878400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263958 (or 263943 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 1266878400 is about 35593.2353123455. The cubic root of 1266878400 is about 1082.0441395455.

The spelling of 1266878400 in words is "one billion, two hundred sixty-six million, eight hundred seventy-eight thousand, four hundred".