16624225 has 12 divisors (see below), whose sum is σ = 20673900. Its totient is φ = 13260800.

The previous prime is 16624219. The next prime is 16624243. The reversal of 16624225 is 52242661.

It can be written as a sum of positive squares in 6 ways, for example, as 246016 + 16378209 = 496^2 + 4047^2 .

It is not a de Polignac number, because 16624225 - 2⁹ = 16623713 is a prime.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 16624193 and 16624202.

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, 10485 + ... + 11965.

It is an arithmetic number, because the mean of its divisors is an integer number (1722825).

Almost surely, 2^16624225 is an apocalyptic number.

It is an amenable number.

16624225 is a deficient number, since it is larger than the sum of its proper divisors (4049675).

16624225 is a wasteful number, since it uses less digits than its factorization.

16624225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940 (or 1935 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 16624225 is about 4077.2815698698. The cubic root of 16624225 is about 255.2194701605.

Adding to 16624225 its reverse (52242661), we get a palindrome (68866886).

The spelling of 16624225 in words is "sixteen million, six hundred twenty-four thousand, two hundred twenty-five".