1664432 has 60 divisors (see below), whose sum is σ = 4113576. Its totient is φ = 645120.

The previous prime is 1664431. The next prime is 1664437. The reversal of 1664432 is 2344661.

It is not an unprimeable number, because it can be changed into a prime (1664431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8528 + ... + 8720.

2^1664432 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 1664432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2056788).

1664432 is an abundant number, since it is smaller than the sum of its proper divisors (2449144).

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

1664432 is a wasteful number, since it uses less digits than its factorization.

1664432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 213 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 1664432 is about 1290.1286757529. The cubic root of 1664432 is about 118.5100966431.

The spelling of 1664432 in words is "one million, six hundred sixty-four thousand, four hundred thirty-two".