265500120 has 128 divisors (see below), whose sum is σ = 829440000. Its totient is φ = 67914240.

The previous prime is 265500061. The next prime is 265500143. The reversal of 265500120 is 21005562.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 554041 + ... + 554519.

It is an arithmetic number, because the mean of its divisors is an integer number (6480000).

Almost surely, 2^265500120 is an apocalyptic number.

265500120 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 265500120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (414720000).

265500120 is an abundant number, since it is smaller than the sum of its proper divisors (563939880).

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

265500120 is a wasteful number, since it uses less digits than its factorization.

265500120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 265500120 is about 16294.1744190984. The cubic root of 265500120 is about 642.7196441026.

Adding to 265500120 its reverse (21005562), we get a palindrome (286505682).

The spelling of 265500120 in words is "two hundred sixty-five million, five hundred thousand, one hundred twenty".