428631 has 8 divisors (see below), whose sum is σ = 653184. Its totient is φ = 244920.

The previous prime is 428629. The next prime is 428633. The reversal of 428631 is 136824.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (428629) and next prime (428633).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 428631 - 2¹ = 428629 is a prime.

It is a super-2 number, since 2×428631² = 367449068322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10185 + ... + 10226.

It is an arithmetic number, because the mean of its divisors is an integer number (81648).

2⁴²⁸⁶³¹ is an apocalyptic number.

428631 is a deficient number, since it is larger than the sum of its proper divisors (224553).

428631 is a wasteful number, since it uses less digits than its factorization.

428631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20421.

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

The square root of 428631 is about 654.6991675571. The cubic root of 428631 is about 75.3982372409.

The spelling of 428631 in words is "four hundred twenty-eight thousand, six hundred thirty-one".