85878643 has 4 divisors (see below), whose sum is σ = 86095360. Its totient is φ = 85661928.

The previous prime is 85878623. The next prime is 85878671. The reversal of 85878643 is 34687858.

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

It is a cyclic number.

It is not a de Polignac number, because 85878643 - 2⁹ = 85878131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85878623) 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, 107763 + ... + 108556.

It is an arithmetic number, because the mean of its divisors is an integer number (21523840).

Almost surely, 2^85878643 is an apocalyptic number.

85878643 is a deficient number, since it is larger than the sum of its proper divisors (216717).

85878643 is a wasteful number, since it uses less digits than its factorization.

85878643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216716.

The product of its digits is 1290240, while the sum is 49.

The square root of 85878643 is about 9267.0730546381. The cubic root of 85878643 is about 441.1927743200.

The spelling of 85878643 in words is "eighty-five million, eight hundred seventy-eight thousand, six hundred forty-three".