628680221 has 8 divisors (see below), whose sum is σ = 686577024. Its totient is φ = 572145840.

The previous prime is 628680211. The next prime is 628680287. The reversal of 628680221 is 122086826.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628680221 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 (628680211) 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, 339641 + ... + 341486.

It is an arithmetic number, because the mean of its divisors is an integer number (85822128).

Almost surely, 2^628680221 is an apocalyptic number.

It is an amenable number.

628680221 is a deficient number, since it is larger than the sum of its proper divisors (57896803).

628680221 is a wasteful number, since it uses less digits than its factorization.

628680221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681211.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 628680221 is about 25073.4963856260. The cubic root of 628680221 is about 856.6628473808.

The spelling of 628680221 in words is "six hundred twenty-eight million, six hundred eighty thousand, two hundred twenty-one".