72198188 has 12 divisors (see below), whose sum is σ = 126477960. Its totient is φ = 36061632.

The previous prime is 72198187. The next prime is 72198199. The reversal of 72198188 is 88189127.

It is not an unprimeable number, because it can be changed into a prime (72198187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4781 + ... + 12932.

It is an arithmetic number, because the mean of its divisors is an integer number (10539830).

Almost surely, 2^72198188 is an apocalyptic number.

It is an amenable number.

72198188 is a deficient number, since it is larger than the sum of its proper divisors (54279772).

72198188 is a wasteful number, since it uses less digits than its factorization.

72198188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18736 (or 18734 counting only the distinct ones).

The product of its digits is 64512, while the sum is 44.

The square root of 72198188 is about 8496.9516886940. The cubic root of 72198188 is about 416.3981257008.

The spelling of 72198188 in words is "seventy-two million, one hundred ninety-eight thousand, one hundred eighty-eight".