628780538000 has 40 divisors (see below), whose sum is σ = 1520391345720. Its totient is φ = 251512214400.

The previous prime is 628780537969. The next prime is 628780538063. The reversal of 628780538000 is 835087826.

It can be written as a sum of positive squares in 4 ways, for example, as 21777495184 + 607003042816 = 147572^2 + 779104^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 157193135 + ... + 157197134.

It is an arithmetic number, because the mean of its divisors is an integer number (38009783643).

Almost surely, 2^628780538000 is an apocalyptic number.

It is an amenable number.

628780538000 is an abundant number, since it is smaller than the sum of its proper divisors (891610807720).

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

628780538000 is a wasteful number, since it uses less digits than its factorization.

628780538000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314390292 (or 314390276 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 628780538000 in words is "six hundred twenty-eight billion, seven hundred eighty million, five hundred thirty-eight thousand".