85640137 has 8 divisors (see below), whose sum is σ = 94820832. Its totient is φ = 76692000.

The previous prime is 85640119. The next prime is 85640143. The reversal of 85640137 is 73104658.

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

It is not a de Polignac number, because 85640137 - 2²³ = 77251529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85640117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57364 + ... + 58837.

It is an arithmetic number, because the mean of its divisors is an integer number (11852604).

Almost surely, 2^85640137 is an apocalyptic number.

It is an amenable number.

85640137 is a deficient number, since it is larger than the sum of its proper divisors (9180695).

85640137 is a wasteful number, since it uses less digits than its factorization.

85640137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116279.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 85640137 is about 9254.1956430583. The cubic root of 85640137 is about 440.7839622081.

The spelling of 85640137 in words is "eighty-five million, six hundred forty thousand, one hundred thirty-seven".