225356778 has 36 divisors (see below), whose sum is σ = 495847170. Its totient is φ = 73971216.

The previous prime is 225356773. The next prime is 225356809. The reversal of 225356778 is 877653522.

225356778 is a `hidden beast` number, since 225 + 356 + 7 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 181360089 + 43996689 = 13467^2 + 6633^2 .

It is not an unprimeable number, because it can be changed into a prime (225356773) 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, 79408 + ... + 82196.

Almost surely, 2^225356778 is an apocalyptic number.

225356778 is an abundant number, since it is smaller than the sum of its proper divisors (270490392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225356778 is a wasteful number, since it uses less digits than its factorization.

225356778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931 (or 2861 counting only the distinct ones).

The product of its digits is 705600, while the sum is 45.

The square root of 225356778 is about 15011.8878892696. The cubic root of 225356778 is about 608.5415106536.

The spelling of 225356778 in words is "two hundred twenty-five million, three hundred fifty-six thousand, seven hundred seventy-eight".