1644253052 has 36 divisors (see below), whose sum is σ = 3119870376. Its totient is φ = 757897920.

The previous prime is 1644253021. The next prime is 1644253067. The reversal of 1644253052 is 2503524461.

It is a super-3 number, since 3×1644253052³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 882602 + ... + 884462.

It is an arithmetic number, because the mean of its divisors is an integer number (86663066).

Almost surely, 2^1644253052 is an apocalyptic number.

It is an amenable number.

1644253052 is a deficient number, since it is larger than the sum of its proper divisors (1475617324).

1644253052 is a wasteful number, since it uses less digits than its factorization.

1644253052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198 (or 3183 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 1644253052 is about 40549.3902790165. The cubic root of 1644253052 is about 1180.2922411285.

The spelling of 1644253052 in words is "one billion, six hundred forty-four million, two hundred fifty-three thousand, fifty-two".