1664742924 has 144 divisors (see below), whose sum is σ = 4697125888. Its totient is φ = 493807104.

The previous prime is 1664742907. The next prime is 1664742929. The reversal of 1664742924 is 4292474661.

1664742924 is a `hidden beast` number, since 166 + 47 + 429 + 24 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1664742924.

It is not an unprimeable number, because it can be changed into a prime (1664742929) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2198754 + ... + 2199510.

Almost surely, 2^1664742924 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 1664742924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2348562944).

1664742924 is an abundant number, since it is smaller than the sum of its proper divisors (3032382964).

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

1664742924 is a wasteful number, since it uses less digits than its factorization.

1664742924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944 (or 939 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 1664742924 is about 40801.2613040332. The cubic root of 1664742924 is about 1185.1747560460.

The spelling of 1664742924 in words is "one billion, six hundred sixty-four million, seven hundred forty-two thousand, nine hundred twenty-four".