1644243468 has 48 divisors (see below), whose sum is σ = 4642573824. Its totient is φ = 442149120.

The previous prime is 1644243323. The next prime is 1644243551. The reversal of 1644243468 is 8643424461.

It is a super-3 number, since 3×1644243468³ (a number of 29 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574288 + ... + 577143.

It is an arithmetic number, because the mean of its divisors is an integer number (96720288).

Almost surely, 2^1644243468 is an apocalyptic number.

It is an amenable number.

1644243468 is an abundant number, since it is smaller than the sum of its proper divisors (2998330356).

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

1644243468 is a wasteful number, since it uses less digits than its factorization.

1644243468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151462 (or 1151460 counting only the distinct ones).

The product of its digits is 442368, while the sum is 42.

The square root of 1644243468 is about 40549.2721019749. The cubic root of 1644243468 is about 1180.2899479002.

The spelling of 1644243468 in words is "one billion, six hundred forty-four million, two hundred forty-three thousand, four hundred sixty-eight".