120128265 has 28 divisors (see below), whose sum is σ = 216138564. Its totient is φ = 64066464.

The previous prime is 120128251. The next prime is 120128291. The reversal of 120128265 is 562821021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 88284816 + 31843449 = 9396^2 + 5643^2 .

It is not a de Polignac number, because 120128265 - 2⁸ = 120128009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 12834 + ... + 20123.

Almost surely, 2^120128265 is an apocalyptic number.

120128265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

120128265 is a deficient number, since it is larger than the sum of its proper divisors (96010299).

120128265 is an frugal number, since it uses more digits than its factorization.

120128265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32980 (or 32965 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 120128265 is about 10960.3040560014. The cubic root of 120128265 is about 493.4180904513.

Adding to 120128265 its reverse (562821021), we get a palindrome (682949286).

The spelling of 120128265 in words is "one hundred twenty million, one hundred twenty-eight thousand, two hundred sixty-five".