155128215 has 64 divisors (see below), whose sum is σ = 289723392. Its totient is φ = 70118400.

The previous prime is 155128201. The next prime is 155128231. The reversal of 155128215 is 512821551.

It is not a de Polignac number, because 155128215 - 2⁶ = 155128151 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 155097 + ... + 156093.

It is an arithmetic number, because the mean of its divisors is an integer number (4526928).

Almost surely, 2^155128215 is an apocalyptic number.

155128215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155128215 is a deficient number, since it is larger than the sum of its proper divisors (134595177).

155128215 is a wasteful number, since it uses less digits than its factorization.

155128215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080.

The product of its digits is 4000, while the sum is 30.

The square root of 155128215 is about 12455.0477718875. The cubic root of 155128215 is about 537.3166087892.

Adding to 155128215 its reverse (512821551), we get a palindrome (667949766).

The spelling of 155128215 in words is "one hundred fifty-five million, one hundred twenty-eight thousand, two hundred fifteen".