16531680 has 192 divisors, whose sum is σ = 59222016. Its totient is φ = 3840000.

The previous prime is 16531679. The next prime is 16531709. The reversal of 16531680 is 8613561.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 163630 + ... + 163730.

It is an arithmetic number, because the mean of its divisors is an integer number (308448).

Almost surely, 2^16531680 is an apocalyptic number.

16531680 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 16531680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29611008).

16531680 is an abundant number, since it is smaller than the sum of its proper divisors (42690336).

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

16531680 is a wasteful number, since it uses less digits than its factorization.

16531680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 16531680 is about 4065.9168707685. The cubic root of 16531680 is about 254.7449969050.

It can be divided in two parts, 1653 and 1680, that added together give a palindrome (3333).

The spelling of 16531680 in words is "sixteen million, five hundred thirty-one thousand, six hundred eighty".