225605278 has 16 divisors (see below), whose sum is σ = 358197840. Its totient is φ = 106272000.

The previous prime is 225605273. The next prime is 225605287. The reversal of 225605278 is 872506522.

It is a super-2 number, since 2×225605278² = 101795482922914568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225605273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9523 + ... + 23278.

It is an arithmetic number, because the mean of its divisors is an integer number (22387365).

Almost surely, 2^225605278 is an apocalyptic number.

225605278 is a deficient number, since it is larger than the sum of its proper divisors (132592562).

225605278 is a wasteful number, since it uses less digits than its factorization.

225605278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33003.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 225605278 is about 15020.1623826109. The cubic root of 225605278 is about 608.7651072347.

The spelling of 225605278 in words is "two hundred twenty-five million, six hundred five thousand, two hundred seventy-eight".