777400007444 has 12 divisors (see below), whose sum is σ = 1397218932564. Its totient is φ = 378194598144.

The previous prime is 777400007443. The next prime is 777400007459. The reversal of 777400007444 is 444700004777.

It can be written as a sum of positive squares in 2 ways, for example, as 574730772100 + 202669235344 = 758110^2 + 450188^2 .

It is a junction number, because it is equal to n+sod(n) for n = 777400007395 and 777400007404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (777400007441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2626351229 + ... + 2626351524.

It is an arithmetic number, because the mean of its divisors is an integer number (116434911047).

Almost surely, 2^777400007444 is an apocalyptic number.

777400007444 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

777400007444 is a deficient number, since it is larger than the sum of its proper divisors (619818925120).

777400007444 is a wasteful number, since it uses less digits than its factorization.

777400007444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5252702794 (or 5252702792 counting only the distinct ones).

The product of its (nonzero) digits is 614656, while the sum is 44.

Adding to 777400007444 its reverse (444700004777), we get a palindrome (1222100012221).

The spelling of 777400007444 in words is "seven hundred seventy-seven billion, four hundred million, seven thousand, four hundred forty-four".