16640144 has 40 divisors (see below), whose sum is σ = 34471008. Its totient is φ = 7754240.

The previous prime is 16640123. The next prime is 16640167. The reversal of 16640144 is 44104661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35399 + ... + 35865.

Almost surely, 2^16640144 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 16640144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17235504).

16640144 is an abundant number, since it is smaller than the sum of its proper divisors (17830864).

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

16640144 is a wasteful number, since it uses less digits than its factorization.

16640144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 617 counting only the distinct ones).

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

The square root of 16640144 is about 4079.2332612882. The cubic root of 16640144 is about 255.3009083951.

The spelling of 16640144 in words is "sixteen million, six hundred forty thousand, one hundred forty-four".