628781312 has 36 divisors (see below), whose sum is σ = 1328945436. Its totient is φ = 295895040.

The previous prime is 628781299. The next prime is 628781323. The reversal of 628781312 is 213187826.

It can be written as a sum of positive squares in 2 ways, for example, as 584478976 + 44302336 = 24176^2 + 6656^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67889 + ... + 76592.

It is an arithmetic number, because the mean of its divisors is an integer number (36915151).

Almost surely, 2^628781312 is an apocalyptic number.

It is an amenable number.

628781312 is an abundant number, since it is smaller than the sum of its proper divisors (700164124).

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

628781312 is a wasteful number, since it uses less digits than its factorization.

628781312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144514 (or 144500 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 628781312 is about 25075.5121981586. The cubic root of 628781312 is about 856.7087616944.

The spelling of 628781312 in words is "six hundred twenty-eight million, seven hundred eighty-one thousand, three hundred twelve".