628625992 has 8 divisors (see below), whose sum is σ = 1178673750. Its totient is φ = 314312992.

The previous prime is 628625939. The next prime is 628625993. The reversal of 628625992 is 299526826.

It can be written as a sum of positive squares in only one way, i.e., 620707396 + 7918596 = 24914^2 + 2814^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (628625993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39289117 + ... + 39289132.

Almost surely, 2^628625992 is an apocalyptic number.

It is an amenable number.

628625992 is a deficient number, since it is larger than the sum of its proper divisors (550047758).

628625992 is a wasteful number, since it uses less digits than its factorization.

628625992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78578255 (or 78578251 counting only the distinct ones).

The product of its digits is 933120, while the sum is 49.

The square root of 628625992 is about 25072.4149614671. The cubic root of 628625992 is about 856.6382151943.

The spelling of 628625992 in words is "six hundred twenty-eight million, six hundred twenty-five thousand, nine hundred ninety-two".