16431616 has 40 divisors (see below), whose sum is σ = 33390720. Its totient is φ = 8076288.

The previous prime is 16431587. The next prime is 16431617. The reversal of 16431616 is 61613461.

16431616 is nontrivially palindromic in base 15.

It is not an unprimeable number, because it can be changed into a prime (16431617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34065 + ... + 34543.

It is an arithmetic number, because the mean of its divisors is an integer number (834768).

Almost surely, 2^16431616 is an apocalyptic number.

16431616 is a gapful number since it is divisible by the number (16) 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 16431616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16695360).

16431616 is an abundant number, since it is smaller than the sum of its proper divisors (16959104).

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

16431616 is an frugal number, since it uses more digits than its factorization.

16431616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564 (or 548 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 16431616 is about 4053.5929741403. The cubic root of 16431616 is about 254.2299775039.

The spelling of 16431616 in words is "sixteen million, four hundred thirty-one thousand, six hundred sixteen".