85709678 has 4 divisors (see below), whose sum is σ = 128564520. Its totient is φ = 42854838.

The previous prime is 85709669. The next prime is 85709693. The reversal of 85709678 is 87690758.

It is a happy number.

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

It is a super-2 number, since 2×85709678² = 14692297805727368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21427418 + ... + 21427421.

It is an arithmetic number, because the mean of its divisors is an integer number (32141130).

Almost surely, 2^85709678 is an apocalyptic number.

85709678 is a deficient number, since it is larger than the sum of its proper divisors (42854842).

85709678 is a wasteful number, since it uses less digits than its factorization.

85709678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42854841.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 85709678 is about 9257.9521493687. The cubic root of 85709678 is about 440.9032375291.

The spelling of 85709678 in words is "eighty-five million, seven hundred nine thousand, six hundred seventy-eight".