84639671 has 4 divisors (see below), whose sum is σ = 85069512. Its totient is φ = 84209832.

The previous prime is 84639649. The next prime is 84639673. The reversal of 84639671 is 17693648.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84639671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84639673) 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, 214625 + ... + 215018.

It is an arithmetic number, because the mean of its divisors is an integer number (21267378).

Almost surely, 2^84639671 is an apocalyptic number.

84639671 is a deficient number, since it is larger than the sum of its proper divisors (429841).

84639671 is a wasteful number, since it uses less digits than its factorization.

84639671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429840.

The product of its digits is 217728, while the sum is 44.

The square root of 84639671 is about 9199.9821195478. The cubic root of 84639671 is about 439.0607910446.

The spelling of 84639671 in words is "eighty-four million, six hundred thirty-nine thousand, six hundred seventy-one".