12278664 has 24 divisors (see below), whose sum is σ = 33254910. Its totient is φ = 4092864.

The previous prime is 12278663. The next prime is 12278683. The reversal of 12278664 is 46687221.

It can be written as a sum of positive squares in only one way, i.e., 10614564 + 1664100 = 3258^2 + 1290^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (12278663) 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 5 ways as a sum of consecutive naturals, for example, 85197 + ... + 85340.

Almost surely, 2^12278664 is an apocalyptic number.

It is an amenable number.

12278664 is an abundant number, since it is smaller than the sum of its proper divisors (20976246).

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

12278664 is a wasteful number, since it uses less digits than its factorization.

12278664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170549 (or 170542 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 12278664 is about 3504.0924645334. The cubic root of 12278664 is about 230.7014752879.

The spelling of 12278664 in words is "twelve million, two hundred seventy-eight thousand, six hundred sixty-four".