7721608 has 8 divisors (see below), whose sum is σ = 14478030. Its totient is φ = 3860800.

The previous prime is 7721521. The next prime is 7721611. The reversal of 7721608 is 8061277.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7387524 + 334084 = 2718^2 + 578^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 7721608.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 482593 + ... + 482608.

Almost surely, 2^7721608 is an apocalyptic number.

It is an amenable number.

7721608 is a deficient number, since it is larger than the sum of its proper divisors (6756422).

7721608 is a wasteful number, since it uses less digits than its factorization.

7721608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965207 (or 965203 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 7721608 is about 2778.7781487553. The cubic root of 7721608 is about 197.6526235734.

The spelling of 7721608 in words is "seven million, seven hundred twenty-one thousand, six hundred eight".