83642220 has 60 divisors (see below), whose sum is σ = 262393824. Its totient is φ = 22304160.

The previous prime is 83642203. The next prime is 83642239. The reversal of 83642220 is 2224638.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24196 + ... + 27435.

Almost surely, 2^83642220 is an apocalyptic number.

It is an amenable number.

83642220 is an abundant number, since it is smaller than the sum of its proper divisors (178751604).

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

83642220 is a wasteful number, since it uses less digits than its factorization.

83642220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51652 (or 51641 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 83642220 is about 9145.6120626233. The cubic root of 83642220 is about 437.3292416602.

Adding to 83642220 its reverse (2224638), we get a palindrome (85866858).

The spelling of 83642220 in words is "eighty-three million, six hundred forty-two thousand, two hundred twenty".