84180220 has 12 divisors (see below), whose sum is σ = 176778504. Its totient is φ = 33672080.

The previous prime is 84180199. The next prime is 84180233. The reversal of 84180220 is 2208148.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2104486 + ... + 2104525.

It is an arithmetic number, because the mean of its divisors is an integer number (14731542).

Almost surely, 2^84180220 is an apocalyptic number.

It is an amenable number.

84180220 is an abundant number, since it is smaller than the sum of its proper divisors (92598284).

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

84180220 is a wasteful number, since it uses less digits than its factorization.

84180220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4209020 (or 4209018 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 84180220 is about 9174.9779291288. The cubic root of 84180220 is about 438.2648953987.

Adding to 84180220 its reverse (2208148), we get a palindrome (86388368).

The spelling of 84180220 in words is "eighty-four million, one hundred eighty thousand, two hundred twenty".