85939640 has 16 divisors (see below), whose sum is σ = 193364280. Its totient is φ = 34375840.

The previous prime is 85939621. The next prime is 85939681. The reversal of 85939640 is 4693958.

It is a junction number, because it is equal to n+sod(n) for n = 85939591 and 85939600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074206 + ... + 1074285.

Almost surely, 2^85939640 is an apocalyptic number.

It is an amenable number.

85939640 is an abundant number, since it is smaller than the sum of its proper divisors (107424640).

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

85939640 is a wasteful number, since it uses less digits than its factorization.

85939640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148502 (or 2148498 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 85939640 is about 9270.3635311675. The cubic root of 85939640 is about 441.2972048892.

The spelling of 85939640 in words is "eighty-five million, nine hundred thirty-nine thousand, six hundred forty".