7720489 has 6 divisors (see below), whose sum is σ = 8981034. Its totient is φ = 6617520.

The previous prime is 7720487. The next prime is 7720507. The reversal of 7720489 is 9840277.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6528025 + 1192464 = 2555^2 + 1092^2 .

It is not a de Polignac number, because 7720489 - 2¹ = 7720487 is a prime.

It is a d-powerful number, because it can be written as 7⁵ + 7⁷ + 2 + 0 + 4² + 8⁷ + 9⁷ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7720481) 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 5 ways as a sum of consecutive naturals, for example, 78732 + ... + 78829.

It is an arithmetic number, because the mean of its divisors is an integer number (1496839).

Almost surely, 2^7720489 is an apocalyptic number.

It is an amenable number.

7720489 is a deficient number, since it is larger than the sum of its proper divisors (1260545).

7720489 is a wasteful number, since it uses less digits than its factorization.

7720489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157575 (or 157568 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 7720489 is about 2778.5767939721. The cubic root of 7720489 is about 197.6430753044.

The spelling of 7720489 in words is "seven million, seven hundred twenty thousand, four hundred eighty-nine".