628451 has 4 divisors (see below), whose sum is σ = 630432. Its totient is φ = 626472.

The previous prime is 628447. The next prime is 628477. The reversal of 628451 is 154826.

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 628451 - 2² = 628447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 628451.

It is not an unprimeable number, because it can be changed into a prime (628051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395 + ... + 1188.

It is an arithmetic number, because the mean of its divisors is an integer number (157608).

2⁶²⁸⁴⁵¹ is an apocalyptic number.

628451 is a deficient number, since it is larger than the sum of its proper divisors (1981).

628451 is a wasteful number, since it uses less digits than its factorization.

628451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980.

The product of its digits is 1920, while the sum is 26.

The square root of 628451 is about 792.7490145059. The cubic root of 628451 is about 85.6558719729.

The spelling of 628451 in words is "six hundred twenty-eight thousand, four hundred fifty-one".