628943780 has 12 divisors (see below), whose sum is σ = 1320781980. Its totient is φ = 251577504.

The previous prime is 628943759. The next prime is 628943827. The reversal of 628943780 is 87349826.

It can be written as a sum of positive squares in 2 ways, for example, as 328406884 + 300536896 = 18122^2 + 17336^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15723575 + ... + 15723614.

It is an arithmetic number, because the mean of its divisors is an integer number (110065165).

Almost surely, 2^628943780 is an apocalyptic number.

It is an amenable number.

628943780 is an abundant number, since it is smaller than the sum of its proper divisors (691838200).

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

628943780 is a wasteful number, since it uses less digits than its factorization.

628943780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31447198 (or 31447196 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 628943780 is about 25078.7515638239. The cubic root of 628943780 is about 856.7825423927.

The spelling of 628943780 in words is "six hundred twenty-eight million, nine hundred forty-three thousand, seven hundred eighty".