628444305 has 16 divisors (see below), whose sum is σ = 1117234560. Its totient is φ = 335170224.

The previous prime is 628444291. The next prime is 628444309. The reversal of 628444305 is 503444826.

It is not a de Polignac number, because 628444305 - 2⁶ = 628444241 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 628444305.

It is not an unprimeable number, because it can be changed into a prime (628444309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2327437 + ... + 2327706.

It is an arithmetic number, because the mean of its divisors is an integer number (69827160).

Almost surely, 2^628444305 is an apocalyptic number.

It is an amenable number.

628444305 is a deficient number, since it is larger than the sum of its proper divisors (488790255).

628444305 is a wasteful number, since it uses less digits than its factorization.

628444305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4655157 (or 4655151 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The square root of 628444305 is about 25068.7914547152. The cubic root of 628444305 is about 856.5556780279. Note that the first 3 decimals are identical.

The spelling of 628444305 in words is "six hundred twenty-eight million, four hundred forty-four thousand, three hundred five".