1563664 has 10 divisors (see below), whose sum is σ = 3029630. Its totient is φ = 781824.

The previous prime is 1563649. The next prime is 1563689. The reversal of 1563664 is 4663651.

It can be written as a sum of positive squares in only one way, i.e., 1016064 + 547600 = 1008^2 + 740^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48849 + ... + 48880.

It is an arithmetic number, because the mean of its divisors is an integer number (302963).

2^1563664 is an apocalyptic number.

It is an amenable number.

1563664 is a deficient number, since it is larger than the sum of its proper divisors (1465966).

1563664 is an equidigital number, since it uses as much as digits as its factorization.

1563664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97737 (or 97731 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 1563664 is about 1250.4655133189. The cubic root of 1563664 is about 116.0685286714.

The spelling of 1563664 in words is "one million, five hundred sixty-three thousand, six hundred sixty-four".