85878129 has 4 divisors (see below), whose sum is σ = 114504176. Its totient is φ = 57252084.

The previous prime is 85878097. The next prime is 85878131. The reversal of 85878129 is 92187858.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 85878129 - 2⁵ = 85878097 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85878829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14313019 + ... + 14313024.

It is an arithmetic number, because the mean of its divisors is an integer number (28626044).

Almost surely, 2^85878129 is an apocalyptic number.

It is an amenable number.

85878129 is a deficient number, since it is larger than the sum of its proper divisors (28626047).

85878129 is a wasteful number, since it uses less digits than its factorization.

85878129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28626046.

The product of its digits is 322560, while the sum is 48.

The square root of 85878129 is about 9267.0453219999. The cubic root of 85878129 is about 441.1918941107.

It can be divided in two parts, 858 and 78129, that added together give a palindrome (78987).

The spelling of 85878129 in words is "eighty-five million, eight hundred seventy-eight thousand, one hundred twenty-nine".