225815778 has 24 divisors (see below), whose sum is σ = 497290716. Its totient is φ = 74037600.

The previous prime is 225815767. The next prime is 225815797. The reversal of 225815778 is 877518522.

225815778 is a `hidden beast` number, since 22 + 58 + 1 + 577 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 140493609 + 85322169 = 11853^2 + 9237^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101733 + ... + 103928.

Almost surely, 2^225815778 is an apocalyptic number.

225815778 is an abundant number, since it is smaller than the sum of its proper divisors (271474938).

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

225815778 is a wasteful number, since it uses less digits than its factorization.

225815778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205730 (or 205727 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 225815778 is about 15027.1679966652. The cubic root of 225815778 is about 608.9543835699.

It can be divided in two parts, 225 and 815778, that added together give a triangular number (816003 = T₁₂₇₇).

The spelling of 225815778 in words is "two hundred twenty-five million, eight hundred fifteen thousand, seven hundred seventy-eight".