85739640 has 64 divisors (see below), whose sum is σ = 293967360. Its totient is φ = 19597440.

The previous prime is 85739627. The next prime is 85739657. The reversal of 85739640 is 4693758.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 85739592 and 85739601.

It is a congruent number.

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, 50196 + ... + 51875.

It is an arithmetic number, because the mean of its divisors is an integer number (4593240).

Almost surely, 2^85739640 is an apocalyptic number.

It is an amenable number.

85739640 is an abundant number, since it is smaller than the sum of its proper divisors (208227720).

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

85739640 is a wasteful number, since it uses less digits than its factorization.

85739640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102092 (or 102088 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 85739640 is about 9259.5701844092. The cubic root of 85739640 is about 440.9546078608.

The spelling of 85739640 in words is "eighty-five million, seven hundred thirty-nine thousand, six hundred forty".