85640811 has 8 divisors (see below), whose sum is σ = 115563840. Its totient is φ = 56405832.

The previous prime is 85640783. The next prime is 85640813. The reversal of 85640811 is 11804658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85640811 - 2⁹ = 85640299 is a prime.

It is a super-3 number, since 3×85640811³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (85640813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171721 + ... + 172218.

It is an arithmetic number, because the mean of its divisors is an integer number (14445480).

Almost surely, 2^85640811 is an apocalyptic number.

85640811 is a deficient number, since it is larger than the sum of its proper divisors (29923029).

85640811 is a wasteful number, since it uses less digits than its factorization.

85640811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344025.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 85640811 is about 9254.2320589015. The cubic root of 85640811 is about 440.7851185491.

The spelling of 85640811 in words is "eighty-five million, six hundred forty thousand, eight hundred eleven".