73120217 has 4 divisors (see below), whose sum is σ = 73341456. Its totient is φ = 72898980.

The previous prime is 73120193. The next prime is 73120219. The reversal of 73120217 is 71202137.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73120217 is a prime.

It is a super-2 number, since 2×73120217² = 10693132268254178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73120192 and 73120201.

It is not an unprimeable number, because it can be changed into a prime (73120219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110123 + ... + 110784.

It is an arithmetic number, because the mean of its divisors is an integer number (18335364).

Almost surely, 2^73120217 is an apocalyptic number.

It is an amenable number.

73120217 is a deficient number, since it is larger than the sum of its proper divisors (221239).

73120217 is a wasteful number, since it uses less digits than its factorization.

73120217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221238.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 73120217 is about 8551.0360191032. The cubic root of 73120217 is about 418.1632128215.

It can be divided in two parts, 73120 and 217, that added together give a palindrome (73337).

The spelling of 73120217 in words is "seventy-three million, one hundred twenty thousand, two hundred seventeen".