72215018 has 8 divisors (see below), whose sum is σ = 108921540. Its totient is φ = 35907840.

The previous prime is 72214993. The next prime is 72215021. The reversal of 72215018 is 81051227.

It can be written as a sum of positive squares in 2 ways, for example, as 65334889 + 6880129 = 8083^2 + 2623^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon 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, 99383 + ... + 100106.

Almost surely, 2^72215018 is an apocalyptic number.

72215018 is a deficient number, since it is larger than the sum of its proper divisors (36706522).

72215018 is a wasteful number, since it uses less digits than its factorization.

72215018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199672.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 72215018 is about 8497.9419861517. The cubic root of 72215018 is about 416.4304784794.

The spelling of 72215018 in words is "seventy-two million, two hundred fifteen thousand, eighteen".