85440321 has 24 divisors (see below), whose sum is σ = 132055040. Its totient is φ = 53071200.

The previous prime is 85440301. The next prime is 85440323. The reversal of 85440321 is 12304458.

It is not a de Polignac number, because 85440321 - 2¹¹ = 85438273 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85440323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6336 + ... + 14526.

Almost surely, 2^85440321 is an apocalyptic number.

It is an amenable number.

85440321 is a deficient number, since it is larger than the sum of its proper divisors (46614719).

85440321 is a wasteful number, since it uses less digits than its factorization.

85440321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8277 (or 8274 counting only the distinct ones).

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

The square root of 85440321 is about 9243.3933704025. The cubic root of 85440321 is about 440.4408821222.

Adding to 85440321 its reverse (12304458), we get a palindrome (97744779).

The spelling of 85440321 in words is "eighty-five million, four hundred forty thousand, three hundred twenty-one".