128228525 has 12 divisors (see below), whose sum is σ = 162882804. Its totient is φ = 100080000.

The previous prime is 128228509. The next prime is 128228531. The reversal of 128228525 is 525822821.

It can be written as a sum of positive squares in 6 ways, for example, as 3928324 + 124300201 = 1982^2 + 11149^2 .

It is not a de Polignac number, because 128228525 - 2⁴ = 128228509 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 11 ways as a sum of consecutive naturals, for example, 61526 + ... + 63575.

It is an arithmetic number, because the mean of its divisors is an integer number (13573567).

Almost surely, 2^128228525 is an apocalyptic number.

It is an amenable number.

128228525 is a deficient number, since it is larger than the sum of its proper divisors (34654279).

128228525 is a wasteful number, since it uses less digits than its factorization.

128228525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125152 (or 125147 counting only the distinct ones).

The product of its digits is 25600, while the sum is 35.

The square root of 128228525 is about 11323.8034687997. The cubic root of 128228525 is about 504.2681619157.

The spelling of 128228525 in words is "one hundred twenty-eight million, two hundred twenty-eight thousand, five hundred twenty-five".