207720225 has 18 divisors (see below), whose sum is σ = 372050406. Its totient is φ = 110784000.

The previous prime is 207720223. The next prime is 207720283. The reversal of 207720225 is 522027702.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 36869184 + 170851041 = 6072^2 + 13071^2 .

It is not a de Polignac number, because 207720225 - 2¹ = 207720223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (207720221) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 461376 + ... + 461825.

It is an arithmetic number, because the mean of its divisors is an integer number (20669467).

Almost surely, 2^207720225 is an apocalyptic number.

207720225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

207720225 is a deficient number, since it is larger than the sum of its proper divisors (164330181).

207720225 is a wasteful number, since it uses less digits than its factorization.

207720225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923217 (or 923209 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 207720225 is about 14412.5023850822. The cubic root of 207720225 is about 592.2334430954.

Adding to 207720225 its reverse (522027702), we get a palindrome (729747927).

The spelling of 207720225 in words is "two hundred seven million, seven hundred twenty thousand, two hundred twenty-five".