1266872904 has 72 divisors (see below), whose sum is σ = 3771415830. Its totient is φ = 383898240.

The previous prime is 1266872891. The next prime is 1266872909. The reversal of 1266872904 is 4092786621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 686544804 + 580328100 = 26202^2 + 24090^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 1266872904.

It is not an unprimeable number, because it can be changed into a prime (1266872909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 63997 + ... + 81420.

Almost surely, 2^1266872904 is an apocalyptic number.

It is an amenable number.

1266872904 is an abundant number, since it is smaller than the sum of its proper divisors (2504542926).

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

1266872904 is a wasteful number, since it uses less digits than its factorization.

1266872904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145451 (or 145433 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1266872904 is about 35593.1581065800. The cubic root of 1266872904 is about 1082.0425748272.

The spelling of 1266872904 in words is "one billion, two hundred sixty-six million, eight hundred seventy-two thousand, nine hundred four".