84871855 has 4 divisors (see below), whose sum is σ = 101846232. Its totient is φ = 67897480.

The previous prime is 84871849. The next prime is 84871859. The reversal of 84871855 is 55817848.

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

It is not a de Polignac number, because 84871855 - 2³ = 84871847 is a prime.

It is a super-2 number, since 2×84871855² = 14406463542282050, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84871859) 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, 8487181 + ... + 8487190.

It is an arithmetic number, because the mean of its divisors is an integer number (25461558).

Almost surely, 2^84871855 is an apocalyptic number.

84871855 is a deficient number, since it is larger than the sum of its proper divisors (16974377).

84871855 is a wasteful number, since it uses less digits than its factorization.

84871855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16974376.

The product of its digits is 358400, while the sum is 46.

The square root of 84871855 is about 9212.5921976391. The cubic root of 84871855 is about 439.4619024642.

The spelling of 84871855 in words is "eighty-four million, eight hundred seventy-one thousand, eight hundred fifty-five".