85801578 has 16 divisors (see below), whose sum is σ = 173123136. Its totient is φ = 28347200.

The previous prime is 85801531. The next prime is 85801579. The reversal of 85801578 is 87510858.

It is not an unprimeable number, because it can be changed into a prime (85801579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62598 + ... + 63953.

It is an arithmetic number, because the mean of its divisors is an integer number (10820196).

Almost surely, 2^85801578 is an apocalyptic number.

85801578 is an abundant number, since it is smaller than the sum of its proper divisors (87321558).

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

85801578 is a wasteful number, since it uses less digits than its factorization.

85801578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126669.

The product of its (nonzero) digits is 89600, while the sum is 42.

The square root of 85801578 is about 9262.9141202971. The cubic root of 85801578 is about 441.0607636307.

The spelling of 85801578 in words is "eighty-five million, eight hundred one thousand, five hundred seventy-eight".