1644125424 has 80 divisors (see below), whose sum is σ = 4477808640. Its totient is φ = 519056640.

The previous prime is 1644125419. The next prime is 1644125477. The reversal of 1644125424 is 4245214461.

It is a super-3 number, since 3×1644125424³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58182 + ... + 81690.

It is an arithmetic number, because the mean of its divisors is an integer number (55972608).

Almost surely, 2^1644125424 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 1644125424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2238904320).

1644125424 is an abundant number, since it is smaller than the sum of its proper divisors (2833683216).

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

1644125424 is a wasteful number, since it uses less digits than its factorization.

1644125424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23598 (or 23592 counting only the distinct ones).

The product of its digits is 30720, while the sum is 33.

The square root of 1644125424 is about 40547.8165133463. The cubic root of 1644125424 is about 1180.2617019857.

Adding to 1644125424 its reverse (4245214461), we get a palindrome (5889339885).

The spelling of 1644125424 in words is "one billion, six hundred forty-four million, one hundred twenty-five thousand, four hundred twenty-four".