7720289 has 4 divisors (see below), whose sum is σ = 8126640. Its totient is φ = 7313940.

The previous prime is 7720283. The next prime is 7720313. The reversal of 7720289 is 9820277.

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 not a de Polignac number, because 7720289 - 2²⁰ = 6671713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7720283) 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, 203147 + ... + 203184.

It is an arithmetic number, because the mean of its divisors is an integer number (2031660).

Almost surely, 2^7720289 is an apocalyptic number.

It is an amenable number.

7720289 is a deficient number, since it is larger than the sum of its proper divisors (406351).

7720289 is a wasteful number, since it uses less digits than its factorization.

7720289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406350.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 7720289 is about 2778.5408040912. The cubic root of 7720289 is about 197.6413686354.

The spelling of 7720289 in words is "seven million, seven hundred twenty thousand, two hundred eighty-nine".