778272728 has 16 divisors (see below), whose sum is σ = 1460187000. Its totient is φ = 388889536.

The previous prime is 778272721. The next prime is 778272749. The reversal of 778272728 is 827272877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778272721) by changing a digit.

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, 17093 + ... + 42996.

Almost surely, 2^778272728 is an apocalyptic number.

It is an amenable number.

778272728 is a deficient number, since it is larger than the sum of its proper divisors (681914272).

778272728 is a wasteful number, since it uses less digits than its factorization.

778272728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61714 (or 61710 counting only the distinct ones).

The product of its digits is 1229312, while the sum is 50.

The square root of 778272728 is about 27897.5398198479. The cubic root of 778272728 is about 919.8364264954.

The spelling of 778272728 in words is "seven hundred seventy-eight million, two hundred seventy-two thousand, seven hundred twenty-eight".