7220779 has 4 divisors (see below), whose sum is σ = 7600840. Its totient is φ = 6840720.

The previous prime is 7220761. The next prime is 7220789. The reversal of 7220779 is 9770227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9770227 = 2053 ⋅4759.

It is a cyclic number.

It is not a de Polignac number, because 7220779 - 2⁵ = 7220747 is a prime.

It is a Duffinian number.

7220779 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7220729) 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, 190002 + ... + 190039.

It is an arithmetic number, because the mean of its divisors is an integer number (1900210).

Almost surely, 2^7220779 is an apocalyptic number.

7220779 is a deficient number, since it is larger than the sum of its proper divisors (380061).

7220779 is a wasteful number, since it uses less digits than its factorization.

7220779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380060.

The product of its (nonzero) digits is 12348, while the sum is 34.

The square root of 7220779 is about 2687.1507214892. The cubic root of 7220779 is about 193.2834568789.

The spelling of 7220779 in words is "seven million, two hundred twenty thousand, seven hundred seventy-nine".