16690000 has 50 divisors (see below), whose sum is σ = 40432370. Its totient is φ = 6672000.

The previous prime is 16689941. The next prime is 16690001. The reversal of 16690000 is 9661.

It can be written as a sum of positive squares in 5 ways, for example, as 6270016 + 10419984 = 2504^2 + 3228^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a super-2 number, since 2×16690000² = 557112200000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16690001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9166 + ... + 10834.

Almost surely, 2^16690000 is an apocalyptic number.

16690000 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 16690000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20216185).

16690000 is an abundant number, since it is smaller than the sum of its proper divisors (23742370).

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

16690000 is an equidigital number, since it uses as much as digits as its factorization.

16690000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 16690000 is about 4085.3396431631. The cubic root of 16690000 is about 255.5556255688. Note that the first 3 decimals are identical.

Adding to 16690000 its reverse (9661), we get a palindrome (16699661).

The spelling of 16690000 in words is "sixteen million, six hundred ninety thousand".