85021685 has 32 divisors (see below), whose sum is σ = 125632512. Its totient is φ = 53951040.

The previous prime is 85021681. The next prime is 85021691. The reversal of 85021685 is 58612058.

It is a happy number.

It is not a de Polignac number, because 85021685 - 2² = 85021681 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85021681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23252 + ... + 26658.

It is an arithmetic number, because the mean of its divisors is an integer number (3926016).

Almost surely, 2^85021685 is an apocalyptic number.

It is an amenable number.

85021685 is a deficient number, since it is larger than the sum of its proper divisors (40610827).

85021685 is a wasteful number, since it uses less digits than its factorization.

85021685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3473.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 85021685 is about 9220.7204165401. The cubic root of 85021685 is about 439.7203543313.

The spelling of 85021685 in words is "eighty-five million, twenty-one thousand, six hundred eighty-five".