85642447 has 8 divisors (see below), whose sum is σ = 98924112. Its totient is φ = 73276800.

The previous prime is 85642441. The next prime is 85642451. The reversal of 85642447 is 74424658.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-85642447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85642441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228804 + ... + 229177.

It is an arithmetic number, because the mean of its divisors is an integer number (12365514).

Almost surely, 2^85642447 is an apocalyptic number.

85642447 is a deficient number, since it is larger than the sum of its proper divisors (13281665).

85642447 is a wasteful number, since it uses less digits than its factorization.

85642447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458009.

The product of its digits is 215040, while the sum is 40.

The square root of 85642447 is about 9254.3204504707. The cubic root of 85642447 is about 440.7879253101.

It can be divided in two parts, 8564 and 2447, that added together give a palindrome (11011).

The spelling of 85642447 in words is "eighty-five million, six hundred forty-two thousand, four hundred forty-seven".