16640100 has 72 divisors (see below), whose sum is σ = 53503520. Its totient is φ = 4436640.

The previous prime is 16640083. The next prime is 16640119. The reversal of 16640100 is 104661.

16640100 is a `hidden beast` number, since 1 + 664 + 0 + 1 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 382 + ... + 5781.

Almost surely, 2^16640100 is an apocalyptic number.

16640100 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 16640100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26751760).

16640100 is an abundant number, since it is smaller than the sum of its proper divisors (36863420).

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

16640100 is a wasteful number, since it uses less digits than its factorization.

16640100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6186 (or 6173 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 16640100 is about 4079.2278681143. The cubic root of 16640100 is about 255.3006833720.

Adding to 16640100 its reverse (104661), we get a palindrome (16744761).

The spelling of 16640100 in words is "sixteen million, six hundred forty thousand, one hundred".