67128025 has 6 divisors (see below), whose sum is σ = 83238782. Its totient is φ = 53702400.

The previous prime is 67128023. The next prime is 67128049. The reversal of 67128025 is 52082176.

It can be written as a sum of positive squares in 3 ways, for example, as 84681 + 67043344 = 291^2 + 8188^2 .

It is not a de Polignac number, because 67128025 - 2¹ = 67128023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67128023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1342536 + ... + 1342585.

Almost surely, 2^67128025 is an apocalyptic number.

It is an amenable number.

67128025 is a deficient number, since it is larger than the sum of its proper divisors (16110757).

67128025 is a wasteful number, since it uses less digits than its factorization.

67128025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2685131 (or 2685126 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 67128025 is about 8193.1694111620. The cubic root of 67128025 is about 406.4133418111.

The spelling of 67128025 in words is "sixty-seven million, one hundred twenty-eight thousand, twenty-five".