1644020196 has 96 divisors (see below), whose sum is σ = 4728987648. Its totient is φ = 432881280.

The previous prime is 1644020171. The next prime is 1644020219. The reversal of 1644020196 is 6910204461.

It is a super-3 number, since 3×1644020196³ (a number of 29 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1334901 + ... + 1336131.

It is an arithmetic number, because the mean of its divisors is an integer number (49260288).

Almost surely, 2^1644020196 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 1644020196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2364493824).

1644020196 is an abundant number, since it is smaller than the sum of its proper divisors (3084967452).

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

1644020196 is a wasteful number, since it uses less digits than its factorization.

1644020196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481 (or 2479 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1644020196 is about 40546.5189134653. The cubic root of 1644020196 is about 1180.2365215816.

The spelling of 1644020196 in words is "one billion, six hundred forty-four million, twenty thousand, one hundred ninety-six".