1644022016 has 72 divisors (see below), whose sum is σ = 4038976704. Its totient is φ = 650373120.

The previous prime is 1644022007. The next prime is 1644022019. The reversal of 1644022016 is 6102204461.

It is a super-3 number, since 3×1644022016³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (1644022019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11990 + ... + 58581.

Almost surely, 2^1644022016 is an apocalyptic number.

1644022016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1644022016 is an abundant number, since it is smaller than the sum of its proper divisors (2394954688).

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

1644022016 is an equidigital number, since it uses as much as digits as its factorization.

1644022016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70607 (or 70593 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1644022016 is about 40546.5413568161. The cubic root of 1644022016 is about 1180.2369571053.

Adding to 1644022016 its reverse (6102204461), we get a palindrome (7746226477).

The spelling of 1644022016 in words is "one billion, six hundred forty-four million, twenty-two thousand, sixteen".