628951 has 4 divisors (see below), whose sum is σ = 640872. Its totient is φ = 617032.

The previous prime is 628939. The next prime is 628973. The reversal of 628951 is 159826.

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 628951 - 2¹³ = 620759 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

628951 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628921) 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, 5881 + ... + 5986.

It is an arithmetic number, because the mean of its divisors is an integer number (160218).

2⁶²⁸⁹⁵¹ is an apocalyptic number.

628951 is a deficient number, since it is larger than the sum of its proper divisors (11921).

628951 is a wasteful number, since it uses less digits than its factorization.

628951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11920.

The product of its digits is 4320, while the sum is 31.

The square root of 628951 is about 793.0643101288. The cubic root of 628951 is about 85.6785820877.

The spelling of 628951 in words is "six hundred twenty-eight thousand, nine hundred fifty-one".