85128025 has 6 divisors (see below), whose sum is σ = 105558782. Its totient is φ = 68102400.

The previous prime is 85128007. The next prime is 85128047. The reversal of 85128025 is 52082158.

It can be written as a sum of positive squares in 3 ways, for example, as 22733824 + 62394201 = 4768^2 + 7899^2 .

It is not a de Polignac number, because 85128025 - 2⁷ = 85127897 is a prime.

It is a Duffinian 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, 1702536 + ... + 1702585.

Almost surely, 2^85128025 is an apocalyptic number.

It is an amenable number.

85128025 is a deficient number, since it is larger than the sum of its proper divisors (20430757).

85128025 is a wasteful number, since it uses less digits than its factorization.

85128025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3405131 (or 3405126 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 85128025 is about 9226.4849753305. The cubic root of 85128025 is about 439.9036031939.

The spelling of 85128025 in words is "eighty-five million, one hundred twenty-eight thousand, twenty-five".