84828721 has 4 divisors (see below), whose sum is σ = 84860992. Its totient is φ = 84796452.

The previous prime is 84828719. The next prime is 84828763. The reversal of 84828721 is 12782848.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84828721 - 2¹ = 84828719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84820721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11805 + ... + 17578.

It is an arithmetic number, because the mean of its divisors is an integer number (21215248).

Almost surely, 2^84828721 is an apocalyptic number.

It is an amenable number.

84828721 is a deficient number, since it is larger than the sum of its proper divisors (32271).

84828721 is a wasteful number, since it uses less digits than its factorization.

84828721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32270.

The product of its digits is 57344, while the sum is 40.

The square root of 84828721 is about 9210.2508652045. The cubic root of 84828721 is about 439.3874413374.

The spelling of 84828721 in words is "eighty-four million, eight hundred twenty-eight thousand, seven hundred twenty-one".