Search a number
BaseRepresentation
bin1111001000000
3101121211
41321000
5221434
655504
731402
oct17100
911554
107744
115900
124594
1336a9
142b72
152464
hex1e40

7744 has 21 divisors (see below), whose sum is σ = 16891. Its totient is φ = 3520.

The previous prime is 7741. The next prime is 7753. The reversal of 7744 is 4477.

7744 = T87 + T88.

It is a happy number.

The square root of 7744 is 88.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (7741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 699 + ... + 709.

7744 is the 88-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7744

7744 is an abundant number, since it is smaller than the sum of its proper divisors (9147).

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

7744 is a wasteful number, since it uses less digits than its factorization.

7744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34 (or 13 counting only the distinct ones).

The product of its digits is 784, while the sum is 22.

The cubic root of 7744 is about 19.7843497730.

Multiplying 7744 by its product of digits (784), we get a square (6071296 = 24642).

Adding to 7744 its reverse (4477), we get a palindrome (12221).

It can be divided in two parts, 77 and 44, that added together give a palindrome (121).

The spelling of 7744 in words is "seven thousand, seven hundred forty-four", and thus it is an iban number.