628944811 has 12 divisors (see below), whose sum is σ = 691971336. Its totient is φ = 571229120.

The previous prime is 628944809. The next prime is 628944817. The reversal of 628944811 is 118449826.

It is not a de Polignac number, because 628944811 - 2¹ = 628944809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628944817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186240 + ... + 189586.

It is an arithmetic number, because the mean of its divisors is an integer number (57664278).

Almost surely, 2^628944811 is an apocalyptic number.

628944811 is a deficient number, since it is larger than the sum of its proper divisors (63026525).

628944811 is a wasteful number, since it uses less digits than its factorization.

628944811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4922 (or 4911 counting only the distinct ones).

The product of its digits is 110592, while the sum is 43.

The square root of 628944811 is about 25078.7721190652. The cubic root of 628944811 is about 856.7830105545.

The spelling of 628944811 in words is "six hundred twenty-eight million, nine hundred forty-four thousand, eight hundred eleven".