84648821 has 4 divisors (see below), whose sum is σ = 84670572. Its totient is φ = 84627072.

The previous prime is 84648787. The next prime is 84648847. The reversal of 84648821 is 12884648.

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

It can be written as a sum of positive squares in 2 ways, for example, as 80748196 + 3900625 = 8986^2 + 1975^2 .

It is a cyclic number.

It is not a de Polignac number, because 84648821 - 2⁶ = 84648757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84648871) 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, 3260 + ... + 13413.

It is an arithmetic number, because the mean of its divisors is an integer number (21167643).

Almost surely, 2^84648821 is an apocalyptic number.

It is an amenable number.

84648821 is a deficient number, since it is larger than the sum of its proper divisors (21751).

84648821 is a wasteful number, since it uses less digits than its factorization.

84648821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21750.

The product of its digits is 98304, while the sum is 41.

The square root of 84648821 is about 9200.4793896840. The cubic root of 84648821 is about 439.0766120792.

The spelling of 84648821 in words is "eighty-four million, six hundred forty-eight thousand, eight hundred twenty-one".