84578425 has 6 divisors (see below), whose sum is σ = 104877278. Its totient is φ = 67662720.

The previous prime is 84578423. The next prime is 84578477. The reversal of 84578425 is 52487548.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 10291264 + 74287161 = 3208^2 + 8619^2 .

It is not a de Polignac number, because 84578425 - 2¹ = 84578423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84578423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1691544 + ... + 1691593.

Almost surely, 2^84578425 is an apocalyptic number.

It is an amenable number.

84578425 is a deficient number, since it is larger than the sum of its proper divisors (20298853).

84578425 is a wasteful number, since it uses less digits than its factorization.

84578425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3383147 (or 3383142 counting only the distinct ones).

The product of its digits is 358400, while the sum is 43.

The square root of 84578425 is about 9196.6529237544. The cubic root of 84578425 is about 438.9548627582.

The spelling of 84578425 in words is "eighty-four million, five hundred seventy-eight thousand, four hundred twenty-five".