72018145 has 4 divisors (see below), whose sum is σ = 86421780. Its totient is φ = 57614512.

The previous prime is 72018119. The next prime is 72018157. The reversal of 72018145 is 54181027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54181027 = 19 ⋅2851633.

It can be written as a sum of positive squares in 2 ways, for example, as 50922496 + 21095649 = 7136^2 + 4593^2 .

It is a cyclic number.

It is not a de Polignac number, because 72018145 - 2¹³ = 72009953 is a prime.

It is a super-2 number, since 2×72018145² = 10373226418482050, which contains 22 as substring.

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, 7201810 + ... + 7201819.

It is an arithmetic number, because the mean of its divisors is an integer number (21605445).

Almost surely, 2^72018145 is an apocalyptic number.

It is an amenable number.

72018145 is a deficient number, since it is larger than the sum of its proper divisors (14403635).

72018145 is a wasteful number, since it uses less digits than its factorization.

72018145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14403634.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 72018145 is about 8486.3505112622. The cubic root of 72018145 is about 416.0517090093.

The spelling of 72018145 in words is "seventy-two million, eighteen thousand, one hundred forty-five".