628791 has 4 divisors (see below), whose sum is σ = 838392. Its totient is φ = 419192.

The previous prime is 628787. The next prime is 628799. The reversal of 628791 is 197826.

628791 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 628791 - 2² = 628787 is a prime.

It is a D-number.

628791 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628799) 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, 104796 + ... + 104801.

It is an arithmetic number, because the mean of its divisors is an integer number (209598).

2⁶²⁸⁷⁹¹ is an apocalyptic number.

628791 is a deficient number, since it is larger than the sum of its proper divisors (209601).

628791 is a wasteful number, since it uses less digits than its factorization.

628791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209600.

The product of its digits is 6048, while the sum is 33.

The square root of 628791 is about 792.9634291693. The cubic root of 628791 is about 85.6713161609.

The spelling of 628791 in words is "six hundred twenty-eight thousand, seven hundred ninety-one".