85909640 has 32 divisors (see below), whose sum is σ = 203472000. Its totient is φ = 32554944.

The previous prime is 85909633. The next prime is 85909667. The reversal of 85909640 is 4690958.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 55760 + ... + 57279.

It is an arithmetic number, because the mean of its divisors is an integer number (6358500).

Almost surely, 2^85909640 is an apocalyptic number.

It is an amenable number.

85909640 is an abundant number, since it is smaller than the sum of its proper divisors (117562360).

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

85909640 is a wasteful number, since it uses less digits than its factorization.

85909640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113069 (or 113065 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 85909640 is about 9268.7453304102. The cubic root of 85909640 is about 441.2458492442.

The spelling of 85909640 in words is "eighty-five million, nine hundred nine thousand, six hundred forty".