7730816 has 16 divisors (see below), whose sum is σ = 15401490. Its totient is φ = 3865344.

The previous prime is 7730809. The next prime is 7730819. The reversal of 7730816 is 6180377.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7268416 + 462400 = 2696^2 + 680^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (7730819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30071 + ... + 30326.

Almost surely, 2^7730816 is an apocalyptic number.

It is an amenable number.

7730816 is a deficient number, since it is larger than the sum of its proper divisors (7670674).

7730816 is an equidigital number, since it uses as much as digits as its factorization.

7730816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60411 (or 60399 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 7730816 is about 2780.4344984193. The cubic root of 7730816 is about 197.7311591320.

The spelling of 7730816 in words is "seven million, seven hundred thirty thousand, eight hundred sixteen".