128631575 has 6 divisors (see below), whose sum is σ = 159503184. Its totient is φ = 102905240.

The previous prime is 128631563. The next prime is 128631589. The reversal of 128631575 is 575136821.

It is not a de Polignac number, because 128631575 - 2⁸ = 128631319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2572607 + ... + 2572656.

It is an arithmetic number, because the mean of its divisors is an integer number (26583864).

Almost surely, 2^128631575 is an apocalyptic number.

128631575 is a deficient number, since it is larger than the sum of its proper divisors (30871609).

128631575 is an equidigital number, since it uses as much as digits as its factorization.

128631575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5145273 (or 5145268 counting only the distinct ones).

The product of its digits is 50400, while the sum is 38.

The square root of 128631575 is about 11341.5860883741. The cubic root of 128631575 is about 504.7959506319.

The spelling of 128631575 in words is "one hundred twenty-eight million, six hundred thirty-one thousand, five hundred seventy-five".