7720449 has 16 divisors (see below), whose sum is σ = 11301120. Its totient is φ = 4649360.

The previous prime is 7720439. The next prime is 7720451. The reversal of 7720449 is 9440277.

It is a cyclic number.

It is not a de Polignac number, because 7720449 - 2⁹ = 7719937 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7720429) 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 15 ways as a sum of consecutive naturals, for example, 5254 + ... + 6560.

It is an arithmetic number, because the mean of its divisors is an integer number (706320).

Almost surely, 2^7720449 is an apocalyptic number.

It is an amenable number.

7720449 is a deficient number, since it is larger than the sum of its proper divisors (3580671).

7720449 is a wasteful number, since it uses less digits than its factorization.

7720449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 7720449 is about 2778.5695960332. The cubic root of 7720449 is about 197.6427339730.

The spelling of 7720449 in words is "seven million, seven hundred twenty thousand, four hundred forty-nine".