72187018 has 32 divisors (see below), whose sum is σ = 116660736. Its totient is φ = 33420288.

The previous prime is 72187013. The next prime is 72187033. The reversal of 72187018 is 81078127.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (72187013) 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 15 ways as a sum of consecutive naturals, for example, 373930 + ... + 374122.

It is an arithmetic number, because the mean of its divisors is an integer number (3645648).

Almost surely, 2^72187018 is an apocalyptic number.

72187018 is a deficient number, since it is larger than the sum of its proper divisors (44473718).

72187018 is a wasteful number, since it uses less digits than its factorization.

72187018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 72187018 is about 8496.2943687233. The cubic root of 72187018 is about 416.3766505221.

The spelling of 72187018 in words is "seventy-two million, one hundred eighty-seven thousand, eighteen".