628431 has 4 divisors (see below), whose sum is σ = 837912. Its totient is φ = 418952.

The previous prime is 628427. The next prime is 628447. The reversal of 628431 is 134826.

It is a happy number.

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 628431 - 2² = 628427 is a prime.

It is a super-2 number, since 2×628431² = 789851043522, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628231) 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, 104736 + ... + 104741.

It is an arithmetic number, because the mean of its divisors is an integer number (209478).

2⁶²⁸⁴³¹ is an apocalyptic number.

628431 is a deficient number, since it is larger than the sum of its proper divisors (209481).

628431 is a wasteful number, since it uses less digits than its factorization.

628431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209480.

The product of its digits is 1152, while the sum is 24.

The square root of 628431 is about 792.7364000726. The cubic root of 628431 is about 85.6549633178.

The spelling of 628431 in words is "six hundred twenty-eight thousand, four hundred thirty-one".