85391475640 has 64 divisors (see below), whose sum is σ = 200102996160. Its totient is φ = 32765322240.

The previous prime is 85391475581. The next prime is 85391475641. The reversal of 85391475640 is 4657419358.

It is a super-2 number, since 2×85391475640² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85391475641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301237 + ... + 511396.

It is an arithmetic number, because the mean of its divisors is an integer number (3126609315).

Almost surely, 2^85391475640 is an apocalyptic number.

It is an amenable number.

85391475640 is an abundant number, since it is smaller than the sum of its proper divisors (114711520520).

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

85391475640 is a wasteful number, since it uses less digits than its factorization.

85391475640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812752 (or 812748 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 85391475640 in words is "eighty-five billion, three hundred ninety-one million, four hundred seventy-five thousand, six hundred forty".