1266878436 has 12 divisors (see below), whose sum is σ = 2956049712. Its totient is φ = 422292808.

The previous prime is 1266878429. The next prime is 1266878507. The reversal of 1266878436 is 6348786621.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52786590 + ... + 52786613.

It is an arithmetic number, because the mean of its divisors is an integer number (246337476).

Almost surely, 2^1266878436 is an apocalyptic number.

It is an amenable number.

1266878436 is an abundant number, since it is smaller than the sum of its proper divisors (1689171276).

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

1266878436 is a wasteful number, since it uses less digits than its factorization.

1266878436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105573210 (or 105573208 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 51.

The square root of 1266878436 is about 35593.2358180596. The cubic root of 1266878436 is about 1082.0441497947.

The spelling of 1266878436 in words is "one billion, two hundred sixty-six million, eight hundred seventy-eight thousand, four hundred thirty-six".