85707840 has 112 divisors (see below), whose sum is σ = 276075648. Its totient is φ = 22523904.

The previous prime is 85707827. The next prime is 85707857. The reversal of 85707840 is 4870758.

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 15 ways as a sum of consecutive naturals, for example, 69469 + ... + 70691.

Almost surely, 2^85707840 is an apocalyptic number.

85707840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85707840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138037824).

85707840 is an abundant number, since it is smaller than the sum of its proper divisors (190367808).

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

85707840 is a wasteful number, since it uses less digits than its factorization.

85707840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316 (or 1306 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 85707840 is about 9257.8528828233. The cubic root of 85707840 is about 440.9000858588.

The spelling of 85707840 in words is "eighty-five million, seven hundred seven thousand, eight hundred forty".