628777388 has 12 divisors (see below), whose sum is σ = 1102623312. Its totient is φ = 313742160.

The previous prime is 628777361. The next prime is 628777399. The reversal of 628777388 is 883777826.

628777388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×628777388² = 790722007320205088, which contains 22 as substring.

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, 159443 + ... + 163338.

It is an arithmetic number, because the mean of its divisors is an integer number (91885276).

Almost surely, 2^628777388 is an apocalyptic number.

It is an amenable number.

628777388 is a deficient number, since it is larger than the sum of its proper divisors (473845924).

628777388 is a wasteful number, since it uses less digits than its factorization.

628777388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323272 (or 323270 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 56.

The square root of 628777388 is about 25075.4339543706. The cubic root of 628777388 is about 856.7069795527.

The spelling of 628777388 in words is "six hundred twenty-eight million, seven hundred seventy-seven thousand, three hundred eighty-eight".