72103018 has 16 divisors (see below), whose sum is σ = 123326280. Its totient is φ = 31320576.

The previous prime is 72103007. The next prime is 72103033. The reversal of 72103018 is 81030127.

It can be written as a sum of positive squares in 4 ways, for example, as 50452609 + 21650409 = 7103^2 + 4653^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 72103018.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 81123 + ... + 82006.

Almost surely, 2^72103018 is an apocalyptic number.

72103018 is a deficient number, since it is larger than the sum of its proper divisors (51223262).

72103018 is a wasteful number, since it uses less digits than its factorization.

72103018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163161.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 72103018 is about 8491.3495982676. The cubic root of 72103018 is about 416.2150830880.

The spelling of 72103018 in words is "seventy-two million, one hundred three thousand, eighteen".