225686778 has 8 divisors (see below), whose sum is σ = 451373568. Its totient is φ = 75228924.

The previous prime is 225686771. The next prime is 225686779. The reversal of 225686778 is 877686522.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

225686778 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 225686778.

It is not an unprimeable number, because it can be changed into a prime (225686771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18807226 + ... + 18807237.

It is an arithmetic number, because the mean of its divisors is an integer number (56421696).

Almost surely, 2^225686778 is an apocalyptic number.

225686778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

225686778 is a wasteful number, since it uses less digits than its factorization.

225686778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37614468.

The product of its digits is 2257920, while the sum is 51.

The square root of 225686778 is about 15022.8751575722. The cubic root of 225686778 is about 608.8384039582.

The spelling of 225686778 in words is "two hundred twenty-five million, six hundred eighty-six thousand, seven hundred seventy-eight".