85840587878 has 4 divisors (see below), whose sum is σ = 128760881820. Its totient is φ = 42920293938.

The previous prime is 85840587871. The next prime is 85840587881. The reversal of 85840587878 is 87878504858.

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

It is a super-3 number, since 3×85840587878³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85840587871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21460146968 + ... + 21460146971.

It is an arithmetic number, because the mean of its divisors is an integer number (32190220455).

Almost surely, 2^85840587878 is an apocalyptic number.

85840587878 is a deficient number, since it is larger than the sum of its proper divisors (42920293942).

85840587878 is a wasteful number, since it uses less digits than its factorization.

85840587878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42920293941.

The product of its (nonzero) digits is 160563200, while the sum is 68.

The spelling of 85840587878 in words is "eighty-five billion, eight hundred forty million, five hundred eighty-seven thousand, eight hundred seventy-eight".