16226640 has 120 divisors (see below), whose sum is σ = 56329728. Its totient is φ = 4181760.

The previous prime is 16226621. The next prime is 16226677. The reversal of 16226640 is 4662261.

It is a happy number.

16226640 is a `hidden beast` number, since 16 + 2 + 2 + 6 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 21957 + ... + 22683.

Almost surely, 2^16226640 is an apocalyptic number.

16226640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16226640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28164864).

16226640 is an abundant number, since it is smaller than the sum of its proper divisors (40103088).

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

16226640 is a wasteful number, since it uses less digits than its factorization.

16226640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 16226640 is about 4028.2303807007. The cubic root of 16226640 is about 253.1684214490.

The spelling of 16226640 in words is "sixteen million, two hundred twenty-six thousand, six hundred forty".