628681648 has 40 divisors (see below), whose sum is σ = 1394553600. Its totient is φ = 268956480.

The previous prime is 628681567. The next prime is 628681663. The reversal of 628681648 is 846186826.

It is a super-2 number, since 2×628681648² = 790481229063991808, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62403 + ... + 71773.

It is an arithmetic number, because the mean of its divisors is an integer number (34863840).

Almost surely, 2^628681648 is an apocalyptic number.

It is an amenable number.

628681648 is an abundant number, since it is smaller than the sum of its proper divisors (765871952).

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

628681648 is a wasteful number, since it uses less digits than its factorization.

628681648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9985 (or 9979 counting only the distinct ones).

The product of its digits is 884736, while the sum is 49.

The square root of 628681648 is about 25073.5248419523. The cubic root of 628681648 is about 856.6634955412.

It can be divided in two parts, 62868 and 1648, that added together give a square (64516 = 254²).

The spelling of 628681648 in words is "six hundred twenty-eight million, six hundred eighty-one thousand, six hundred forty-eight".