1664136 has 48 divisors (see below), whose sum is σ = 4668300. Its totient is φ = 534912.

The previous prime is 1664123. The next prime is 1664227. The reversal of 1664136 is 6314661.

1664136 is a `hidden beast` number, since 16 + 641 + 3 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1664100 + 36 = 1290^2 + 6^2 .

It is a nude number because it is divisible by every one of its digits.

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, 1690 + ... + 2486.

2^1664136 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 1664136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2334150).

1664136 is an abundant number, since it is smaller than the sum of its proper divisors (3004164).

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

1664136 is a wasteful number, since it uses less digits than its factorization.

1664136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 831 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1664136 is about 1290.0139534129. The cubic root of 1664136 is about 118.5030710094.

Adding to 1664136 its reverse (6314661), we get a palindrome (7978797).

It can be divided in two parts, 16641 and 36, that multiplied together give a square (599076 = 774²).

The spelling of 1664136 in words is "one million, six hundred sixty-four thousand, one hundred thirty-six".