225155920 has 40 divisors (see below), whose sum is σ = 571079520. Its totient is φ = 81874560.

The previous prime is 225155911. The next prime is 225155921. The reversal of 225155920 is 29551522.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×225155920² = 101390376622092800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225155921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127050 + ... + 128809.

It is an arithmetic number, because the mean of its divisors is an integer number (14276988).

Almost surely, 2^225155920 is an apocalyptic number.

225155920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225155920 is an abundant number, since it is smaller than the sum of its proper divisors (345923600).

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

225155920 is a wasteful number, since it uses less digits than its factorization.

225155920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255883 (or 255877 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 225155920 is about 15005.1964332361. The cubic root of 225155920 is about 608.3606614774.

The spelling of 225155920 in words is "two hundred twenty-five million, one hundred fifty-five thousand, nine hundred twenty".