7720704 has 72 divisors (see below), whose sum is σ = 22851920. Its totient is φ = 2571264.

The previous prime is 7720697. The next prime is 7720717. The reversal of 7720704 is 4070277.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 6354 + ... + 7470.

Almost surely, 2^7720704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7720704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11425960).

7720704 is an abundant number, since it is smaller than the sum of its proper divisors (15131216).

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

7720704 is a wasteful number, since it uses less digits than its factorization.

7720704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142 (or 1122 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 27.

The square root of 7720704 is about 2778.6154825740. The cubic root of 7720704 is about 197.6449099406.

The spelling of 7720704 in words is "seven million, seven hundred twenty thousand, seven hundred four".