628634638 has 16 divisors (see below), whose sum is σ = 951090480. Its totient is φ = 311610816.

The previous prime is 628634623. The next prime is 628634641. The reversal of 628634638 is 836436826.

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 7 ways as a sum of consecutive naturals, for example, 397333 + ... + 398911.

It is an arithmetic number, because the mean of its divisors is an integer number (59443155).

Almost surely, 2^628634638 is an apocalyptic number.

628634638 is a deficient number, since it is larger than the sum of its proper divisors (322455842).

628634638 is a wasteful number, since it uses less digits than its factorization.

628634638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3171.

The product of its digits is 995328, while the sum is 46.

The square root of 628634638 is about 25072.5873814411. The cubic root of 628634638 is about 856.6421425216.

The spelling of 628634638 in words is "six hundred twenty-eight million, six hundred thirty-four thousand, six hundred thirty-eight".