84570823 has 4 divisors (see below), whose sum is σ = 86633568. Its totient is φ = 82508080.

The previous prime is 84570779. The next prime is 84570833. The reversal of 84570823 is 32807548.

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-84570823 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 (84570833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031311 + ... + 1031392.

It is an arithmetic number, because the mean of its divisors is an integer number (21658392).

Almost surely, 2^84570823 is an apocalyptic number.

84570823 is a deficient number, since it is larger than the sum of its proper divisors (2062745).

84570823 is a wasteful number, since it uses less digits than its factorization.

84570823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062744.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 84570823 is about 9196.2396119283. The cubic root of 84570823 is about 438.9417111188.

The spelling of 84570823 in words is "eighty-four million, five hundred seventy thousand, eight hundred twenty-three".