85128925 has 18 divisors (see below), whose sum is σ = 122795898. Its totient is φ = 58373280.

The previous prime is 85128919. The next prime is 85128943. The reversal of 85128925 is 52982158.

It can be written as a sum of positive squares in 3 ways, for example, as 25190361 + 59938564 = 5019^2 + 7742^2 .

It is not a de Polignac number, because 85128925 - 2⁵ = 85128893 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 17 ways as a sum of consecutive naturals, for example, 33522 + ... + 35971.

Almost surely, 2^85128925 is an apocalyptic number.

It is an amenable number.

85128925 is a deficient number, since it is larger than the sum of its proper divisors (37666973).

85128925 is a wasteful number, since it uses less digits than its factorization.

85128925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69517 (or 69505 counting only the distinct ones).

The product of its digits is 57600, while the sum is 40.

The square root of 85128925 is about 9226.5337478384. The cubic root of 85128925 is about 439.9051534544.

The spelling of 85128925 in words is "eighty-five million, one hundred twenty-eight thousand, nine hundred twenty-five".