83643820 has 24 divisors (see below), whose sum is σ = 189164304. Its totient is φ = 30883776.

The previous prime is 83643811. The next prime is 83643821. The reversal of 83643820 is 2834638.

It is not an unprimeable number, because it can be changed into a prime (83643821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160594 + ... + 161113.

It is an arithmetic number, because the mean of its divisors is an integer number (7881846).

Almost surely, 2^83643820 is an apocalyptic number.

It is an amenable number.

83643820 is an abundant number, since it is smaller than the sum of its proper divisors (105520484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

83643820 is a wasteful number, since it uses less digits than its factorization.

83643820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321729 (or 321727 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 83643820 is about 9145.6995358474. The cubic root of 83643820 is about 437.3320302133.

The spelling of 83643820 in words is "eighty-three million, six hundred forty-three thousand, eight hundred twenty".