16530640 has 60 divisors (see below), whose sum is σ = 44719236. Its totient is φ = 5666304.

The previous prime is 16530623. The next prime is 16530653. The reversal of 16530640 is 4603561.

It can be written as a sum of positive squares in 2 ways, for example, as 10732176 + 5798464 = 3276^2 + 2408^2 .

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 11 ways as a sum of consecutive naturals, for example, 1812 + ... + 6028.

Almost surely, 2^16530640 is an apocalyptic number.

16530640 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 16530640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22359618).

16530640 is an abundant number, since it is smaller than the sum of its proper divisors (28188596).

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

16530640 is a wasteful number, since it uses less digits than its factorization.

16530640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4244 (or 4231 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 16530640 is about 4065.7889763243. The cubic root of 16530640 is about 254.7396548315.

The spelling of 16530640 in words is "sixteen million, five hundred thirty thousand, six hundred forty".