128571915 has 32 divisors (see below), whose sum is σ = 210988800. Its totient is φ = 66834560.

The previous prime is 128571893. The next prime is 128571953. The reversal of 128571915 is 519175821.

It is not a de Polignac number, because 128571915 - 2¹¹ = 128569867 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115381 + ... + 116489.

It is an arithmetic number, because the mean of its divisors is an integer number (6593400).

Almost surely, 2^128571915 is an apocalyptic number.

128571915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128571915 is a deficient number, since it is larger than the sum of its proper divisors (82416885).

128571915 is a wasteful number, since it uses less digits than its factorization.

128571915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307.

The product of its digits is 25200, while the sum is 39.

The square root of 128571915 is about 11338.9556397404. The cubic root of 128571915 is about 504.7178962257.

The spelling of 128571915 in words is "one hundred twenty-eight million, five hundred seventy-one thousand, nine hundred fifteen".