16504540 has 72 divisors (see below), whose sum is σ = 39659760. Its totient is φ = 5750784.

The previous prime is 16504529. The next prime is 16504541. The reversal of 16504540 is 4540561.

It is a super-2 number, since 2×16504540² = 544799681223200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16504541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64092 + ... + 64348.

It is an arithmetic number, because the mean of its divisors is an integer number (550830).

Almost surely, 2^16504540 is an apocalyptic number.

16504540 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 16504540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19829880).

16504540 is an abundant number, since it is smaller than the sum of its proper divisors (23155220).

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

16504540 is a wasteful number, since it uses less digits than its factorization.

16504540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 16504540 is about 4062.5779992512. The cubic root of 16504540 is about 254.6055158982.

The spelling of 16504540 in words is "sixteen million, five hundred four thousand, five hundred forty".