7720545 has 16 divisors (see below), whose sum is σ = 14117760. Its totient is φ = 3529344.

The previous prime is 7720529. The next prime is 7720561. The reversal of 7720545 is 5450277.

It is an interprime number because it is at equal distance from previous prime (7720529) and next prime (7720561).

It is not a de Polignac number, because 7720545 - 2⁴ = 7720529 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 36660 + ... + 36869.

It is an arithmetic number, because the mean of its divisors is an integer number (882360).

Almost surely, 2^7720545 is an apocalyptic number.

It is an amenable number.

7720545 is a deficient number, since it is larger than the sum of its proper divisors (6397215).

7720545 is a wasteful number, since it uses less digits than its factorization.

7720545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73544.

The product of its (nonzero) digits is 9800, while the sum is 30.

The square root of 7720545 is about 2778.5868710551. The cubic root of 7720545 is about 197.6435531664.

The spelling of 7720545 in words is "seven million, seven hundred twenty thousand, five hundred forty-five".