72011217 has 4 divisors (see below), whose sum is σ = 96014960. Its totient is φ = 48007476.

The previous prime is 72011209. The next prime is 72011221. The reversal of 72011217 is 71211027.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71211027 = 3 ⋅23737009.

It is not a de Polignac number, because 72011217 - 2³ = 72011209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72011193 and 72011202.

It is not an unprimeable number, because it can be changed into a prime (72011207) 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 3 ways as a sum of consecutive naturals, for example, 12001867 + ... + 12001872.

It is an arithmetic number, because the mean of its divisors is an integer number (24003740).

Almost surely, 2^72011217 is an apocalyptic number.

It is an amenable number.

72011217 is a deficient number, since it is larger than the sum of its proper divisors (24003743).

72011217 is a wasteful number, since it uses less digits than its factorization.

72011217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24003742.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 72011217 is about 8485.9423165610. The cubic root of 72011217 is about 416.0383674703.

The spelling of 72011217 in words is "seventy-two million, eleven thousand, two hundred seventeen".