628826891 has 16 divisors (see below), whose sum is σ = 794738688. Its totient is φ = 483278400.

The previous prime is 628826873. The next prime is 628826893. The reversal of 628826891 is 198628826.

628826891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-628826891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628826893) 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, 50315 + ... + 61556.

It is an arithmetic number, because the mean of its divisors is an integer number (49671168).

Almost surely, 2^628826891 is an apocalyptic number.

628826891 is a deficient number, since it is larger than the sum of its proper divisors (165911797).

628826891 is a wasteful number, since it uses less digits than its factorization.

628826891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111962.

The product of its digits is 663552, while the sum is 50.

The square root of 628826891 is about 25076.4210165645. The cubic root of 628826891 is about 856.7294615172.

The spelling of 628826891 in words is "six hundred twenty-eight million, eight hundred twenty-six thousand, eight hundred ninety-one".