85143240 has 384 divisors, whose sum is σ = 358525440. Its totient is φ = 17031168.

The previous prime is 85143197. The next prime is 85143257. The reversal of 85143240 is 4234158.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 753424 + ... + 753536.

It is an arithmetic number, because the mean of its divisors is an integer number (933660).

Almost surely, 2^85143240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85143240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179262720).

85143240 is an abundant number, since it is smaller than the sum of its proper divisors (273382200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85143240 is a wasteful number, since it uses less digits than its factorization.

85143240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 85143240 is about 9227.3094670115. The cubic root of 85143240 is about 439.9298097403.

Adding to 85143240 its reverse (4234158), we get a palindrome (89377398).

The spelling of 85143240 in words is "eighty-five million, one hundred forty-three thousand, two hundred forty".