7720663 has 4 divisors (see below), whose sum is σ = 8056368. Its totient is φ = 7384960.

The previous prime is 7720649. The next prime is 7720667. The reversal of 7720663 is 3660277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3660277 = 67 ⋅54631.

It is a cyclic number.

It is not a de Polignac number, because 7720663 - 2⁹ = 7720151 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7720667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167818 + ... + 167863.

It is an arithmetic number, because the mean of its divisors is an integer number (2014092).

Almost surely, 2^7720663 is an apocalyptic number.

7720663 is a deficient number, since it is larger than the sum of its proper divisors (335705).

7720663 is a wasteful number, since it uses less digits than its factorization.

7720663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335704.

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 7720663 is about 2778.6081047892. The cubic root of 7720663 is about 197.6445600824.

The spelling of 7720663 in words is "seven million, seven hundred twenty thousand, six hundred sixty-three".