628634886 has 32 divisors (see below), whose sum is σ = 1372464000. Its totient is φ = 190370880.

The previous prime is 628634861. The next prime is 628634939. The reversal of 628634886 is 688436826.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176370 + ... + 179898.

It is an arithmetic number, because the mean of its divisors is an integer number (42889500).

Almost surely, 2^628634886 is an apocalyptic number.

628634886 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

628634886 is an abundant number, since it is smaller than the sum of its proper divisors (743829114).

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

628634886 is a wasteful number, since it uses less digits than its factorization.

628634886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6244.

The product of its digits is 2654208, while the sum is 51.

The square root of 628634886 is about 25072.5923270810. The cubic root of 628634886 is about 856.6422551717.

The spelling of 628634886 in words is "six hundred twenty-eight million, six hundred thirty-four thousand, eight hundred eighty-six".