225999540 has 72 divisors (see below), whose sum is σ = 738272808. Its totient is φ = 55630080.

The previous prime is 225999539. The next prime is 225999577. The reversal of 225999540 is 45999522.

225999540 is a `hidden beast` number, since 2 + 2 + 599 + 9 + 54 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10614564 + 215384976 = 3258^2 + 14676^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45951 + ... + 50630.

It is an arithmetic number, because the mean of its divisors is an integer number (10253789).

Almost surely, 2^225999540 is an apocalyptic number.

225999540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225999540 is an abundant number, since it is smaller than the sum of its proper divisors (512273268).

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

225999540 is a wasteful number, since it uses less digits than its factorization.

225999540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96609 (or 96604 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 225999540 is about 15033.2810789927. The cubic root of 225999540 is about 609.1195216245.

The spelling of 225999540 in words is "two hundred twenty-five million, nine hundred ninety-nine thousand, five hundred forty".