628840866 has 32 divisors (see below), whose sum is σ = 1286316288. Its totient is φ = 204871680.

The previous prime is 628840799. The next prime is 628840867. The reversal of 628840866 is 668048826.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (628840867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82530 + ... + 89826.

It is an arithmetic number, because the mean of its divisors is an integer number (40197384).

Almost surely, 2^628840866 is an apocalyptic number.

628840866 is an abundant number, since it is smaller than the sum of its proper divisors (657475422).

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

628840866 is a wasteful number, since it uses less digits than its factorization.

628840866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7626.

The product of its (nonzero) digits is 884736, while the sum is 48.

The square root of 628840866 is about 25076.6996632332. The cubic root of 628840866 is about 856.7358080999.

The spelling of 628840866 in words is "six hundred twenty-eight million, eight hundred forty thousand, eight hundred sixty-six".