1644461952 has 384 divisors, whose sum is σ = 5538183840. Its totient is φ = 429391872.

The previous prime is 1644461947. The next prime is 1644461977. The reversal of 1644461952 is 2591644461.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×1644461952² = 5408510223151300608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16953168 + ... + 16953264.

Almost surely, 2^1644461952 is an apocalyptic number.

1644461952 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 1644461952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2769091920).

1644461952 is an abundant number, since it is smaller than the sum of its proper divisors (3893721888).

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

1644461952 is a wasteful number, since it uses less digits than its factorization.

1644461952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 179 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 1644461952 is about 40551.9660682438. The cubic root of 1644461952 is about 1180.3422238258.

The spelling of 1644461952 in words is "one billion, six hundred forty-four million, four hundred sixty-one thousand, nine hundred fifty-two".