16721632 has 48 divisors (see below), whose sum is σ = 35048160. Its totient is φ = 7838208.

The previous prime is 16721629. The next prime is 16721633. The reversal of 16721632 is 23612761.

It is a super-2 number, since 2×16721632² = 559225953486848, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 16721632.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34093 + ... + 34579.

It is an arithmetic number, because the mean of its divisors is an integer number (730170).

Almost surely, 2^16721632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16721632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17524080).

16721632 is an abundant number, since it is smaller than the sum of its proper divisors (18326528).

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

16721632 is a wasteful number, since it uses less digits than its factorization.

16721632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563 (or 555 counting only the distinct ones).

The product of its digits is 3024, while the sum is 28.

The square root of 16721632 is about 4089.2092145059. The cubic root of 16721632 is about 255.7169723628.

The spelling of 16721632 in words is "sixteen million, seven hundred twenty-one thousand, six hundred thirty-two".