1023664 has 20 divisors (see below), whose sum is σ = 2002104. Its totient is φ = 507008.

The previous prime is 1023653. The next prime is 1023697. The reversal of 1023664 is 4663201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1959 + ... + 2425.

2^1023664 is an apocalyptic number.

It is an amenable number.

1023664 is a deficient number, since it is larger than the sum of its proper divisors (978440).

1023664 is a wasteful number, since it uses less digits than its factorization.

1023664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1023664 is about 1011.7628180557. The cubic root of 1023664 is about 100.7826584764.

Adding to 1023664 its reverse (4663201), we get a palindrome (5686865).

The spelling of 1023664 in words is "one million, twenty-three thousand, six hundred sixty-four".