628781716 has 6 divisors (see below), whose sum is σ = 1100368010. Its totient is φ = 314390856.

The previous prime is 628781641. The next prime is 628781719. The reversal of 628781716 is 617187826.

628781716 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 608115600 + 20666116 = 24660^2 + 4546^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628781719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78597711 + ... + 78597718.

Almost surely, 2^628781716 is an apocalyptic number.

It is an amenable number.

628781716 is a deficient number, since it is larger than the sum of its proper divisors (471586294).

628781716 is a wasteful number, since it uses less digits than its factorization.

628781716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157195433 (or 157195431 counting only the distinct ones).

The product of its digits is 225792, while the sum is 46.

The square root of 628781716 is about 25075.5202538252. The cubic root of 628781716 is about 856.7089451765.

The spelling of 628781716 in words is "six hundred twenty-eight million, seven hundred eighty-one thousand, seven hundred sixteen".