778728 has 32 divisors (see below), whose sum is σ = 1978560. Its totient is φ = 255360.

The previous prime is 778727. The next prime is 778733. The reversal of 778728 is 827877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778727) by changing a digit.

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, 1476 + ... + 1932.

It is an arithmetic number, because the mean of its divisors is an integer number (61830).

2⁷⁷⁸⁷²⁸ is an apocalyptic number.

It is an amenable number.

778728 is an abundant number, since it is smaller than the sum of its proper divisors (1199832).

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

778728 is a wasteful number, since it uses less digits than its factorization.

778728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537 (or 533 counting only the distinct ones).

The product of its digits is 43904, while the sum is 39.

The square root of 778728 is about 882.4556646087. The cubic root of 778728 is about 92.0015752723.

The spelling of 778728 in words is "seven hundred seventy-eight thousand, seven hundred twenty-eight".