1428664 has 16 divisors (see below), whose sum is σ = 2705400. Its totient is φ = 707232.

The previous prime is 1428649. The next prime is 1428671. The reversal of 1428664 is 4668241.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 22 + ... + 1690.

2^1428664 is an apocalyptic number.

It is an amenable number.

1428664 is a deficient number, since it is larger than the sum of its proper divisors (1276736).

1428664 is a wasteful number, since it uses less digits than its factorization.

1428664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782 (or 1778 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 1428664 is about 1195.2673341140. The cubic root of 1428664 is about 112.6272206872.

The spelling of 1428664 in words is "one million, four hundred twenty-eight thousand, six hundred sixty-four".