83644820 has 48 divisors (see below), whose sum is σ = 207234048. Its totient is φ = 27751680.

The previous prime is 83644793. The next prime is 83644843. The reversal of 83644820 is 2844638.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5297 + ... + 13976.

It is an arithmetic number, because the mean of its divisors is an integer number (4317376).

Almost surely, 2^83644820 is an apocalyptic number.

It is an amenable number.

83644820 is an abundant number, since it is smaller than the sum of its proper divisors (123589228).

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

83644820 is a wasteful number, since it uses less digits than its factorization.

83644820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19320 (or 19318 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 83644820 is about 9145.7542061877. The cubic root of 83644820 is about 437.3337730410. Note that the first 3 decimals are identical.

The spelling of 83644820 in words is "eighty-three million, six hundred forty-four thousand, eight hundred twenty".