628801891 has 4 divisors (see below), whose sum is σ = 629370000. Its totient is φ = 628233784.

The previous prime is 628801841. The next prime is 628801909. The reversal of 628801891 is 198108826.

628801891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 628801891 - 2²¹ = 626704739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628801801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282391 + ... + 284608.

It is an arithmetic number, because the mean of its divisors is an integer number (157342500).

Almost surely, 2^628801891 is an apocalyptic number.

628801891 is a deficient number, since it is larger than the sum of its proper divisors (568109).

628801891 is a wasteful number, since it uses less digits than its factorization.

628801891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568108.

The product of its (nonzero) digits is 55296, while the sum is 43.

The square root of 628801891 is about 25075.9225353725. The cubic root of 628801891 is about 856.7181078253.

The spelling of 628801891 in words is "six hundred twenty-eight million, eight hundred one thousand, eight hundred ninety-one".