1566720 has 144 divisors (see below), whose sum is σ = 5749380. Its totient is φ = 393216.

The previous prime is 1566673. The next prime is 1566731. The reversal of 1566720 is 276651.

It can be written as a sum of positive squares in 2 ways, for example, as 1557504 + 9216 = 1248^2 + 96^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×1566720² = 4909223116800, which contains 22 as substring.

It is a zygodrome in base 4.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92152 + ... + 92168.

2^1566720 is an apocalyptic number.

1566720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1566720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2874690).

1566720 is an abundant number, since it is smaller than the sum of its proper divisors (4182660).

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

1566720 is a wasteful number, since it uses less digits than its factorization.

1566720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50 (or 27 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 1566720 is about 1251.6868617989. The cubic root of 1566720 is about 116.1440936260.

The spelling of 1566720 in words is "one million, five hundred sixty-six thousand, seven hundred twenty".