1644226512 has 20 divisors (see below), whose sum is σ = 4247585280. Its totient is φ = 548075488.

The previous prime is 1644226511. The next prime is 1644226537. The reversal of 1644226512 is 2156224461.

It is a super-3 number, since 3×1644226512³ (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 not an unprimeable number, because it can be changed into a prime (1644226511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17127312 + ... + 17127407.

It is an arithmetic number, because the mean of its divisors is an integer number (212379264).

Almost surely, 2^1644226512 is an apocalyptic number.

1644226512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1644226512 is an abundant number, since it is smaller than the sum of its proper divisors (2603358768).

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

1644226512 is a wasteful number, since it uses less digits than its factorization.

1644226512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34254730 (or 34254724 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 1644226512 is about 40549.0630224670. The cubic root of 1644226512 is about 1180.2858907019.

The spelling of 1644226512 in words is "one billion, six hundred forty-four million, two hundred twenty-six thousand, five hundred twelve".