628993780 has 12 divisors (see below), whose sum is σ = 1320886980. Its totient is φ = 251597504.

The previous prime is 628993777. The next prime is 628993793. The reversal of 628993780 is 87399826.

It can be written as a sum of positive squares in 2 ways, for example, as 502746084 + 126247696 = 22422^2 + 11236^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15724825 + ... + 15724864.

It is an arithmetic number, because the mean of its divisors is an integer number (110073915).

Almost surely, 2^628993780 is an apocalyptic number.

It is an amenable number.

628993780 is an abundant number, since it is smaller than the sum of its proper divisors (691893200).

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

628993780 is a wasteful number, since it uses less digits than its factorization.

628993780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31449698 (or 31449696 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 628993780 is about 25079.7484038417. The cubic root of 628993780 is about 856.8052460605.

The spelling of 628993780 in words is "six hundred twenty-eight million, nine hundred ninety-three thousand, seven hundred eighty".