1267664944 has 60 divisors (see below), whose sum is σ = 3039548016. Its totient is φ = 501486336.

The previous prime is 1267664917. The next prime is 1267664947. The reversal of 1267664944 is 4494667621.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1267664947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14559 + ... + 52414.

Almost surely, 2^1267664944 is an apocalyptic number.

1267664944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1267664944 is an abundant number, since it is smaller than the sum of its proper divisors (1771883072).

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

1267664944 is a wasteful number, since it uses less digits than its factorization.

1267664944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67014 (or 66995 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 49.

The square root of 1267664944 is about 35604.2826637471. The cubic root of 1267664944 is about 1082.2680229784.

The spelling of 1267664944 in words is "one billion, two hundred sixty-seven million, six hundred sixty-four thousand, nine hundred forty-four".