16118640 has 120 divisors (see below), whose sum is σ = 55169088. Its totient is φ = 4216320.

The previous prime is 16118639. The next prime is 16118647. The reversal of 16118640 is 4681161.

16118640 is a `hidden beast` number, since 1 + 6 + 1 + 18 + 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 not an unprimeable number, because it can be changed into a prime (16118647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43737 + ... + 44103.

Almost surely, 2^16118640 is an apocalyptic number.

16118640 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 16118640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27584544).

16118640 is an abundant number, since it is smaller than the sum of its proper divisors (39050448).

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

16118640 is a wasteful number, since it uses less digits than its factorization.

16118640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 16118640 is about 4014.8026103409. The cubic root of 16118640 is about 252.6054978558.

The spelling of 16118640 in words is "sixteen million, one hundred eighteen thousand, six hundred forty".