16324640 has 48 divisors (see below), whose sum is σ = 38814552. Its totient is φ = 6488064.

The previous prime is 16324597. The next prime is 16324657. The reversal of 16324640 is 4642361.

It can be written as a sum of positive squares in 4 ways, for example, as 16289296 + 35344 = 4036^2 + 188^2 .

It is a super-2 number, since 2×16324640² = 532987742259200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40922 + ... + 41318.

Almost surely, 2^16324640 is an apocalyptic number.

16324640 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 16324640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19407276).

16324640 is an abundant number, since it is smaller than the sum of its proper divisors (22489912).

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

16324640 is a wasteful number, since it uses less digits than its factorization.

16324640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 16324640 is about 4040.3762201062. The cubic root of 16324640 is about 253.6770649500.

The spelling of 16324640 in words is "sixteen million, three hundred twenty-four thousand, six hundred forty".