16621572 has 24 divisors (see below), whose sum is σ = 42309792. Its totient is φ = 5036800.

The previous prime is 16621567. The next prime is 16621573. The reversal of 16621572 is 27512661.

It is not an unprimeable number, because it can be changed into a prime (16621573) 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, 62829 + ... + 63092.

It is an arithmetic number, because the mean of its divisors is an integer number (1762908).

Almost surely, 2^16621572 is an apocalyptic number.

16621572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16621572 is an abundant number, since it is smaller than the sum of its proper divisors (25688220).

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

16621572 is a wasteful number, since it uses less digits than its factorization.

16621572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125939 (or 125937 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 16621572 is about 4076.9562175721. The cubic root of 16621572 is about 255.2058929205.

The spelling of 16621572 in words is "sixteen million, six hundred twenty-one thousand, five hundred seventy-two".