1646724664 has 64 divisors (see below), whose sum is σ = 3458851200. Its totient is φ = 729990144.

The previous prime is 1646724649. The next prime is 1646724679. The reversal of 1646724664 is 4664276461.

It is an interprime number because it is at equal distance from previous prime (1646724649) and next prime (1646724679).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301284 + ... + 306700.

It is an arithmetic number, because the mean of its divisors is an integer number (54044550).

Almost surely, 2^1646724664 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 1646724664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1729425600).

1646724664 is an abundant number, since it is smaller than the sum of its proper divisors (1812126536).

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

1646724664 is a wasteful number, since it uses less digits than its factorization.

1646724664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5552 (or 5548 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 46.

The square root of 1646724664 is about 40579.8553964895. The cubic root of 1646724664 is about 1180.8833431643.

The spelling of 1646724664 in words is "one billion, six hundred forty-six million, seven hundred twenty-four thousand, six hundred sixty-four".