775380728 has 16 divisors (see below), whose sum is σ = 1530357000. Its totient is φ = 367285536.

The previous prime is 775380713. The next prime is 775380757. The reversal of 775380728 is 827083577.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2550443 + ... + 2550746.

Almost surely, 2^775380728 is an apocalyptic number.

It is an amenable number.

775380728 is a deficient number, since it is larger than the sum of its proper divisors (754976272).

775380728 is a wasteful number, since it uses less digits than its factorization.

775380728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5101214 (or 5101210 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 47.

The square root of 775380728 is about 27845.6590512776. The cubic root of 775380728 is about 918.6956658259.

The spelling of 775380728 in words is "seven hundred seventy-five million, three hundred eighty thousand, seven hundred twenty-eight".