628343644 has 6 divisors (see below), whose sum is σ = 1099601384. Its totient is φ = 314171820.

The previous prime is 628343641. The next prime is 628343659. The reversal of 628343644 is 446343826.

It is a junction number, because it is equal to n+sod(n) for n = 628343597 and 628343606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628343641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78542952 + ... + 78542959.

Almost surely, 2^628343644 is an apocalyptic number.

It is an amenable number.

628343644 is a deficient number, since it is larger than the sum of its proper divisors (471257740).

628343644 is a wasteful number, since it uses less digits than its factorization.

628343644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157085915 (or 157085913 counting only the distinct ones).

The product of its digits is 331776, while the sum is 40.

The square root of 628343644 is about 25066.7836788049. The cubic root of 628343644 is about 856.5099426809.

The spelling of 628343644 in words is "six hundred twenty-eight million, three hundred forty-three thousand, six hundred forty-four".