16645000 has 40 divisors (see below), whose sum is σ = 39010950. Its totient is φ = 6656000.

The previous prime is 16644977. The next prime is 16645033. The reversal of 16645000 is 54661.

It can be written as a sum of positive squares in 5 ways, for example, as 47524 + 16597476 = 218^2 + 4074^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3336 + ... + 6664.

Almost surely, 2^16645000 is an apocalyptic number.

16645000 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 16645000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19505475).

16645000 is an abundant number, since it is smaller than the sum of its proper divisors (22365950).

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

16645000 is an equidigital number, since it uses as much as digits as its factorization.

16645000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355 (or 3336 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 16645000 is about 4079.8284277651. The cubic root of 16645000 is about 255.3257403243.

Adding to 16645000 its reverse (54661), we get a palindrome (16699661).

The spelling of 16645000 in words is "sixteen million, six hundred forty-five thousand".