1566864 has 120 divisors (see below), whose sum is σ = 5055232. Its totient is φ = 466560.

The previous prime is 1566857. The next prime is 1566881. The reversal of 1566864 is 4686651.

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

It is a nialpdrome in base 6.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50529 + ... + 50559.

2^1566864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1566864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2527616).

1566864 is an abundant number, since it is smaller than the sum of its proper divisors (3488368).

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

1566864 is a wasteful number, since it uses less digits than its factorization.

1566864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 49 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 1566864 is about 1251.7443828514. The cubic root of 1566864 is about 116.1476518532.

The spelling of 1566864 in words is "one million, five hundred sixty-six thousand, eight hundred sixty-four".