225731780 has 96 divisors (see below), whose sum is σ = 535973760. Its totient is φ = 79349760.

The previous prime is 225731771. The next prime is 225731819. The reversal of 225731780 is 87137522.

It is a self number, because there is not a number n which added to its sum of digits gives 225731780.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 535970 + ... + 536390.

It is an arithmetic number, because the mean of its divisors is an integer number (5583060).

Almost surely, 2^225731780 is an apocalyptic number.

225731780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 225731780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267986880).

225731780 is an abundant number, since it is smaller than the sum of its proper divisors (310241980).

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

225731780 is a wasteful number, since it uses less digits than its factorization.

225731780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 225731780 is about 15024.3728654477. The cubic root of 225731780 is about 608.8788687788.

The spelling of 225731780 in words is "two hundred twenty-five million, seven hundred thirty-one thousand, seven hundred eighty".