85640078 has 4 divisors (see below), whose sum is σ = 128460120. Its totient is φ = 42820038.

The previous prime is 85640069. The next prime is 85640081. The reversal of 85640078 is 87004658.

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

It is a congruent number.

It is an unprimeable number.

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, 21410018 + ... + 21410021.

It is an arithmetic number, because the mean of its divisors is an integer number (32115030).

Almost surely, 2^85640078 is an apocalyptic number.

85640078 is a deficient number, since it is larger than the sum of its proper divisors (42820042).

85640078 is a wasteful number, since it uses less digits than its factorization.

85640078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42820041.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 85640078 is about 9254.1924553145. The cubic root of 85640078 is about 440.7838609851.

The spelling of 85640078 in words is "eighty-five million, six hundred forty thousand, seventy-eight".