1266257256 has 96 divisors (see below), whose sum is σ = 3494601600. Its totient is φ = 382060800.

The previous prime is 1266257231. The next prime is 1266257263. The reversal of 1266257256 is 6527526621.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 786180 + ... + 787788.

It is an arithmetic number, because the mean of its divisors is an integer number (36402100).

Almost surely, 2^1266257256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266257256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1747300800).

1266257256 is an abundant number, since it is smaller than the sum of its proper divisors (2228344344).

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

1266257256 is a wasteful number, since it uses less digits than its factorization.

1266257256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911 (or 1896 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 1266257256 is about 35584.5086519401. The cubic root of 1266257256 is about 1081.8672704005.

The spelling of 1266257256 in words is "one billion, two hundred sixty-six million, two hundred fifty-seven thousand, two hundred fifty-six".