628679621 has 8 divisors (see below), whose sum is σ = 632400000. Its totient is φ = 624970080.

The previous prime is 628679531. The next prime is 628679641. The reversal of 628679621 is 126976826.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 628679621 - 2¹⁰ = 628678597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628679641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132905 + ... + 137553.

It is an arithmetic number, because the mean of its divisors is an integer number (79050000).

Almost surely, 2^628679621 is an apocalyptic number.

It is an amenable number.

628679621 is a deficient number, since it is larger than the sum of its proper divisors (3720379).

628679621 is a wasteful number, since it uses less digits than its factorization.

628679621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5419.

The product of its digits is 435456, while the sum is 47.

The square root of 628679621 is about 25073.4844207980. The cubic root of 628679621 is about 856.6625748533.

The spelling of 628679621 in words is "six hundred twenty-eight million, six hundred seventy-nine thousand, six hundred twenty-one".