1664364 has 48 divisors (see below), whose sum is σ = 4290048. Its totient is φ = 499008.

The previous prime is 1664353. The next prime is 1664387. The reversal of 1664364 is 4634661.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7219 + ... + 7445.

It is an arithmetic number, because the mean of its divisors is an integer number (89376).

2^1664364 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 1664364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2145024).

1664364 is an abundant number, since it is smaller than the sum of its proper divisors (2625684).

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

1664364 is a wasteful number, since it uses less digits than its factorization.

1664364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 292 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 1664364 is about 1290.1023215234. The cubic root of 1664364 is about 118.5084827199.

The spelling of 1664364 in words is "one million, six hundred sixty-four thousand, three hundred sixty-four".