85566140 has 24 divisors (see below), whose sum is σ = 196024752. Its totient is φ = 31114880.

The previous prime is 85566137. The next prime is 85566149. The reversal of 85566140 is 4166558.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 85566140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85566149) 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, 194249 + ... + 194688.

It is an arithmetic number, because the mean of its divisors is an integer number (8167698).

Almost surely, 2^85566140 is an apocalyptic number.

It is an amenable number.

85566140 is an abundant number, since it is smaller than the sum of its proper divisors (110458612).

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

85566140 is a wasteful number, since it uses less digits than its factorization.

85566140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388957 (or 388955 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 85566140 is about 9250.1967546642. The cubic root of 85566140 is about 440.6569731171.

The spelling of 85566140 in words is "eighty-five million, five hundred sixty-six thousand, one hundred forty".