1644066240 has 56 divisors (see below), whose sum is σ = 5219913360. Its totient is φ = 438417408.

The previous prime is 1644066227. The next prime is 1644066253. The reversal of 1644066240 is 426604461.

It is an interprime number because it is at equal distance from previous prime (1644066227) and next prime (1644066253).

It is a super-3 number, since 3×1644066240³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 855325 + ... + 857244.

Almost surely, 2^1644066240 is an apocalyptic number.

1644066240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1644066240 is an abundant number, since it is smaller than the sum of its proper divisors (3575847120).

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

1644066240 is a wasteful number, since it uses less digits than its factorization.

1644066240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712589 (or 1712579 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 1644066240 is about 40547.0867017595. The cubic root of 1644066240 is about 1180.2475397558.

The spelling of 1644066240 in words is "one billion, six hundred forty-four million, sixty-six thousand, two hundred forty".