1267664 has 10 divisors (see below), whose sum is σ = 2456130. Its totient is φ = 633824.

The previous prime is 1267663. The next prime is 1267681. The reversal of 1267664 is 4667621.

It can be written as a sum of positive squares in only one way, i.e., 1227664 + 40000 = 1108^2 + 200^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1267664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1267663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39599 + ... + 39630.

It is an arithmetic number, because the mean of its divisors is an integer number (245613).

2^1267664 is an apocalyptic number.

It is an amenable number.

1267664 is a deficient number, since it is larger than the sum of its proper divisors (1188466).

1267664 is an equidigital number, since it uses as much as digits as its factorization.

1267664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79237 (or 79231 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 1267664 is about 1125.9058575210. The cubic root of 1267664 is about 108.2267754332.

It can be divided in two parts, 12 and 67664, that added together give a palindrome (67676).

The spelling of 1267664 in words is "one million, two hundred sixty-seven thousand, six hundred sixty-four".