1644266952 has 160 divisors (see below), whose sum is σ = 4756752000. Its totient is φ = 530323200.

The previous prime is 1644266951. The next prime is 1644266957. The reversal of 1644266952 is 2596624461.

1644266952 is a `hidden beast` number, since 164 + 426 + 69 + 5 + 2 = 666.

It is a super-3 number, since 3×1644266952³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1644266898 and 1644266907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644266951) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5286877 + ... + 5287187.

It is an arithmetic number, because the mean of its divisors is an integer number (29729700).

Almost surely, 2^1644266952 is an apocalyptic number.

1644266952 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 1644266952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2378376000).

1644266952 is an abundant number, since it is smaller than the sum of its proper divisors (3112485048).

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

1644266952 is a wasteful number, since it uses less digits than its factorization.

1644266952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 556 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 1644266952 is about 40549.5616745730. The cubic root of 1644266952 is about 1180.2955670593.

The spelling of 1644266952 in words is "one billion, six hundred forty-four million, two hundred sixty-six thousand, nine hundred fifty-two".