128709025 has 9 divisors (see below), whose sum is σ = 159669561. Its totient is φ = 102921840.

The previous prime is 128708999. The next prime is 128709029. The reversal of 128709025 is 520907821.

The square root of 128709025 is 11345.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 55845729 + 72863296 = 7473^2 + 8536^2 .

It is not a de Polignac number, because 128709025 - 2²¹ = 126611873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128709029) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 55591 + ... + 57859.

Almost surely, 2^128709025 is an apocalyptic number.

128709025 is the 11345-th square number.

128709025 is the 5673-rd centered octagonal number.

It is an amenable number.

128709025 is a deficient number, since it is larger than the sum of its proper divisors (30960536).

128709025 is an frugal number, since it uses more digits than its factorization.

128709025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4548 (or 2274 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The cubic root of 128709025 is about 504.8972440670.

The spelling of 128709025 in words is "one hundred twenty-eight million, seven hundred nine thousand, twenty-five".