84640847 has 4 divisors (see below), whose sum is σ = 85160280. Its totient is φ = 84121416.

The previous prime is 84640823. The next prime is 84640859. The reversal of 84640847 is 74804648.

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 84640847 - 2⁶ = 84640783 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 (84640817) 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, 259472 + ... + 259797.

It is an arithmetic number, because the mean of its divisors is an integer number (21290070).

Almost surely, 2^84640847 is an apocalyptic number.

84640847 is a deficient number, since it is larger than the sum of its proper divisors (519433).

84640847 is a wasteful number, since it uses less digits than its factorization.

84640847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519432.

The product of its (nonzero) digits is 172032, while the sum is 41.

The square root of 84640847 is about 9200.0460324935. The cubic root of 84640847 is about 439.0628245005.

The spelling of 84640847 in words is "eighty-four million, six hundred forty thousand, eight hundred forty-seven".