631428 has 24 divisors (see below), whose sum is σ = 1684032. Its totient is φ = 180384.

The previous prime is 631409. The next prime is 631429. The reversal of 631428 is 824136.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 631398 and 631407.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 631428.

It is not an unprimeable number, because it can be changed into a prime (631429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3675 + ... + 3842.

It is an arithmetic number, because the mean of its divisors is an integer number (70168).

2⁶³¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

631428 is an abundant number, since it is smaller than the sum of its proper divisors (1052604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631428 is a wasteful number, since it uses less digits than its factorization.

631428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7531 (or 7529 counting only the distinct ones).

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

The square root of 631428 is about 794.6244395940. The cubic root of 631428 is about 85.7909108449.

The spelling of 631428 in words is "six hundred thirty-one thousand, four hundred twenty-eight".