85717578 has 16 divisors (see below), whose sum is σ = 171925056. Its totient is φ = 28490880.

The previous prime is 85717561. The next prime is 85717603. The reversal of 85717578 is 87571758.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18118 + ... + 22353.

It is an arithmetic number, because the mean of its divisors is an integer number (10745316).

Almost surely, 2^85717578 is an apocalyptic number.

85717578 is an abundant number, since it is smaller than the sum of its proper divisors (86207478).

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

85717578 is a wasteful number, since it uses less digits than its factorization.

85717578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40829.

The product of its digits is 548800, while the sum is 48.

The square root of 85717578 is about 9258.3787997683. The cubic root of 85717578 is about 440.9167833684.

The spelling of 85717578 in words is "eighty-five million, seven hundred seventeen thousand, five hundred seventy-eight".