225640436 has 24 divisors (see below), whose sum is σ = 461778240. Its totient is φ = 94453632.

The previous prime is 225640421. The next prime is 225640463. The reversal of 225640436 is 634046522.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92501 + ... + 94908.

It is an arithmetic number, because the mean of its divisors is an integer number (19240760).

Almost surely, 2^225640436 is an apocalyptic number.

It is an amenable number.

225640436 is an abundant number, since it is smaller than the sum of its proper divisors (236137804).

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

225640436 is a wasteful number, since it uses less digits than its factorization.

225640436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187463 (or 187461 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 225640436 is about 15021.3326972010. The cubic root of 225640436 is about 608.7967286166.

Adding to 225640436 its reverse (634046522), we get a palindrome (859686958).

The spelling of 225640436 in words is "two hundred twenty-five million, six hundred forty thousand, four hundred thirty-six".