628491 has 4 divisors (see below), whose sum is σ = 837992. Its totient is φ = 418992.

The previous prime is 628487. The next prime is 628493. The reversal of 628491 is 194826.

628491 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 not a de Polignac number, because 628491 - 2² = 628487 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628493) 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, 104746 + ... + 104751.

It is an arithmetic number, because the mean of its divisors is an integer number (209498).

2⁶²⁸⁴⁹¹ is an apocalyptic number.

628491 is a deficient number, since it is larger than the sum of its proper divisors (209501).

628491 is a wasteful number, since it uses less digits than its factorization.

628491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209500.

The product of its digits is 3456, while the sum is 30.

The square root of 628491 is about 792.7742427703. The cubic root of 628491 is about 85.6576892253.

The spelling of 628491 in words is "six hundred twenty-eight thousand, four hundred ninety-one".