85009240 has 32 divisors (see below), whose sum is σ = 193428000. Its totient is φ = 33620224.

The previous prime is 85009207. The next prime is 85009241. The reversal of 85009240 is 4290058.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 85009199 and 85009208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85009241) 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, 8380 + ... + 15499.

It is an arithmetic number, because the mean of its divisors is an integer number (6044625).

Almost surely, 2^85009240 is an apocalyptic number.

It is an amenable number.

85009240 is an abundant number, since it is smaller than the sum of its proper divisors (108418760).

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

85009240 is a wasteful number, since it uses less digits than its factorization.

85009240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23979 (or 23975 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 85009240 is about 9220.0455530328. The cubic root of 85009240 is about 439.6988986802.

Adding to 85009240 its reverse (4290058), we get a palindrome (89299298).

The spelling of 85009240 in words is "eighty-five million, nine thousand, two hundred forty".