1644797532 has 96 divisors (see below), whose sum is σ = 4661798400. Its totient is φ = 440616960.

The previous prime is 1644797513. The next prime is 1644797537. The reversal of 1644797532 is 2357974461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644797537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 399219 + ... + 403317.

It is an arithmetic number, because the mean of its divisors is an integer number (48560400).

Almost surely, 2^1644797532 is an apocalyptic number.

1644797532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644797532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2330899200).

1644797532 is an abundant number, since it is smaller than the sum of its proper divisors (3017000868).

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

1644797532 is a wasteful number, since it uses less digits than its factorization.

1644797532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4411 (or 4409 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 48.

The square root of 1644797532 is about 40556.1035110623. The cubic root of 1644797532 is about 1180.4225078974.

The spelling of 1644797532 in words is "one billion, six hundred forty-four million, seven hundred ninety-seven thousand, five hundred thirty-two".