16721280 has 96 divisors (see below), whose sum is σ = 57760560. Its totient is φ = 4457472.

The previous prime is 16721279. The next prime is 16721291. The reversal of 16721280 is 8212761.

16721280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4309 + ... + 7211.

Almost surely, 2^16721280 is an apocalyptic number.

16721280 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 16721280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28880280).

16721280 is an abundant number, since it is smaller than the sum of its proper divisors (41039280).

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

16721280 is a wasteful number, since it uses less digits than its factorization.

16721280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2928 (or 2913 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 16721280 is about 4089.1661741729. The cubic root of 16721280 is about 255.7151780203.

The spelling of 16721280 in words is "sixteen million, seven hundred twenty-one thousand, two hundred eighty".