128565025 has 12 divisors (see below), whose sum is σ = 161668224. Its totient is φ = 101402000.

The previous prime is 128565023. The next prime is 128565049. The reversal of 128565025 is 520565821.

It is not a de Polignac number, because 128565025 - 2¹ = 128565023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128565023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34441 + ... + 37990.

It is an arithmetic number, because the mean of its divisors is an integer number (13472352).

Almost surely, 2^128565025 is an apocalyptic number.

It is an amenable number.

128565025 is a deficient number, since it is larger than the sum of its proper divisors (33103199).

128565025 is an equidigital number, since it uses as much as digits as its factorization.

128565025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72512 (or 72507 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 128565025 is about 11338.6518158024. The cubic root of 128565025 is about 504.7088803417.

The spelling of 128565025 in words is "one hundred twenty-eight million, five hundred sixty-five thousand, twenty-five".