1664532 has 18 divisors (see below), whose sum is σ = 4207658. Its totient is φ = 554832.

The previous prime is 1664501. The next prime is 1664543. The reversal of 1664532 is 2354661.

1664532 is a `hidden beast` number, since 16 + 645 + 3 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1648656 + 15876 = 1284^2 + 126^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1664496 and 1664505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23083 + ... + 23154.

2^1664532 is an apocalyptic number.

1664532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1664532 is an abundant number, since it is smaller than the sum of its proper divisors (2543126).

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

1664532 is a wasteful number, since it uses less digits than its factorization.

1664532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46247 (or 46242 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1664532 is about 1290.1674309949. The cubic root of 1664532 is about 118.5124699797.

The spelling of 1664532 in words is "one million, six hundred sixty-four thousand, five hundred thirty-two".