72184220 has 12 divisors (see below), whose sum is σ = 151586904. Its totient is φ = 28873680.

The previous prime is 72184207. The next prime is 72184223. The reversal of 72184220 is 2248127.

It is a self number, because there is not a number n which added to its sum of digits gives 72184220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72184223) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1804586 + ... + 1804625.

It is an arithmetic number, because the mean of its divisors is an integer number (12632242).

Almost surely, 2^72184220 is an apocalyptic number.

It is an amenable number.

72184220 is an abundant number, since it is smaller than the sum of its proper divisors (79402684).

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

72184220 is a wasteful number, since it uses less digits than its factorization.

72184220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3609220 (or 3609218 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 72184220 is about 8496.1297071078. The cubic root of 72184220 is about 416.3712708064.

The spelling of 72184220 in words is "seventy-two million, one hundred eighty-four thousand, two hundred twenty".