85668578 has 4 divisors (see below), whose sum is σ = 128502870. Its totient is φ = 42834288.

The previous prime is 85668571. The next prime is 85668601. The reversal of 85668578 is 87586658.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 81775849 + 3892729 = 9043^2 + 1973^2 .

It is a super-3 number, since 3×85668578³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (85668571) 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 as a sum of consecutive naturals, namely, 21417143 + ... + 21417146.

Almost surely, 2^85668578 is an apocalyptic number.

85668578 is a deficient number, since it is larger than the sum of its proper divisors (42834292).

85668578 is a wasteful number, since it uses less digits than its factorization.

85668578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42834291.

The product of its digits is 3225600, while the sum is 53.

The square root of 85668578 is about 9255.7321698502. The cubic root of 85668578 is about 440.8327514386.

The spelling of 85668578 in words is "eighty-five million, six hundred sixty-eight thousand, five hundred seventy-eight".