76720217 has 4 divisors (see below), whose sum is σ = 87680256. Its totient is φ = 65760180.

The previous prime is 76720199. The next prime is 76720219. The reversal of 76720217 is 71202767.

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: 71202767 = 103 ⋅691289.

It is a cyclic number.

It is not a de Polignac number, because 76720217 - 2¹⁰ = 76719193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76720219) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5480009 + ... + 5480022.

It is an arithmetic number, because the mean of its divisors is an integer number (21920064).

Almost surely, 2^76720217 is an apocalyptic number.

It is an amenable number.

76720217 is a deficient number, since it is larger than the sum of its proper divisors (10960039).

76720217 is a wasteful number, since it uses less digits than its factorization.

76720217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10960038.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 76720217 is about 8759.0077634399. The cubic root of 76720217 is about 424.9161855481.

The spelling of 76720217 in words is "seventy-six million, seven hundred twenty thousand, two hundred seventeen".