16628025 has 12 divisors (see below), whose sum is σ = 27491792. Its totient is φ = 8868240.

The previous prime is 16628009. The next prime is 16628039. The reversal of 16628025 is 52082661.

16628025 = 552² + 553² + ... + 601².

It is not a de Polignac number, because 16628025 - 2⁴ = 16628009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16627983 and 16628001.

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, 110779 + ... + 110928.

Almost surely, 2^16628025 is an apocalyptic number.

16628025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16628025 is a deficient number, since it is larger than the sum of its proper divisors (10863767).

16628025 is a wasteful number, since it uses less digits than its factorization.

16628025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221720 (or 221715 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 16628025 is about 4077.7475400029. The cubic root of 16628025 is about 255.2389148785.

The spelling of 16628025 in words is "sixteen million, six hundred twenty-eight thousand, twenty-five".