16621272 has 48 divisors (see below), whose sum is σ = 46977840. Its totient is φ = 5299008.

The previous prime is 16621271. The next prime is 16621279. The reversal of 16621272 is 27212661.

16621272 is a `hidden beast` number, since 16 + 621 + 27 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16621271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3363 + ... + 6674.

It is an arithmetic number, because the mean of its divisors is an integer number (978705).

Almost surely, 2^16621272 is an apocalyptic number.

16621272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16621272 is an abundant number, since it is smaller than the sum of its proper divisors (30356568).

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

16621272 is a wasteful number, since it uses less digits than its factorization.

16621272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10072 (or 10065 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 16621272 is about 4076.9194252524. The cubic root of 16621272 is about 255.2043575217.

The spelling of 16621272 in words is "sixteen million, six hundred twenty-one thousand, two hundred seventy-two".