7720506 has 24 divisors (see below), whose sum is σ = 16809780. Its totient is φ = 2560896.

The previous prime is 7720487. The next prime is 7720507. The reversal of 7720506 is 6050277.

It can be written as a sum of positive squares in 2 ways, for example, as 7700625 + 19881 = 2775^2 + 141^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7720506.

It is not an unprimeable number, because it can be changed into a prime (7720507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3186 + ... + 5058.

Almost surely, 2^7720506 is an apocalyptic number.

7720506 is an abundant number, since it is smaller than the sum of its proper divisors (9089274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7720506 is a wasteful number, since it uses less digits than its factorization.

7720506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110 (or 2107 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 7720506 is about 2778.5798530904. The cubic root of 7720506 is about 197.6432203699.

The spelling of 7720506 in words is "seven million, seven hundred twenty thousand, five hundred six".