640223225 has 6 divisors (see below), whose sum is σ = 793876830. Its totient is φ = 512178560.

The previous prime is 640223209. The next prime is 640223231. The reversal of 640223225 is 522322046.

640223225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 221652544 + 418570681 = 14888^2 + 20459^2 .

It is not a de Polignac number, because 640223225 - 2⁴ = 640223209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640223194 and 640223203.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12804440 + ... + 12804489.

It is an arithmetic number, because the mean of its divisors is an integer number (132312805).

Almost surely, 2^640223225 is an apocalyptic number.

It is an amenable number.

640223225 is a deficient number, since it is larger than the sum of its proper divisors (153653605).

640223225 is a wasteful number, since it uses less digits than its factorization.

640223225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25608939 (or 25608934 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 640223225 is about 25302.6327681528. The cubic root of 640223225 is about 861.8740568004.

The spelling of 640223225 in words is "six hundred forty million, two hundred twenty-three thousand, two hundred twenty-five".