628160221 has 8 divisors (see below), whose sum is σ = 692980344. Its totient is φ = 565697280.

The previous prime is 628160219. The next prime is 628160233. The reversal of 628160221 is 122061826.

It can be written as a sum of positive squares in 4 ways, for example, as 39564100 + 588596121 = 6290^2 + 24261^2 .

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 628160221 - 2¹ = 628160219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 628160221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628160201) 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, 588736 + ... + 589801.

It is an arithmetic number, because the mean of its divisors is an integer number (86622543).

Almost surely, 2^628160221 is an apocalyptic number.

It is an amenable number.

628160221 is a deficient number, since it is larger than the sum of its proper divisors (64820123).

628160221 is a wasteful number, since it uses less digits than its factorization.

628160221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178591.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 628160221 is about 25063.1247253809. The cubic root of 628160221 is about 856.4265918404.

The spelling of 628160221 in words is "six hundred twenty-eight million, one hundred sixty thousand, two hundred twenty-one".