31628427 has 16 divisors (see below), whose sum is σ = 44160000. Its totient is φ = 20097792.

The previous prime is 31628417. The next prime is 31628431. The reversal of 31628427 is 72482613.

It is not a de Polignac number, because 31628427 - 2⁴ = 31628411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31628417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24699 + ... + 25947.

It is an arithmetic number, because the mean of its divisors is an integer number (2760000).

Almost surely, 2^31628427 is an apocalyptic number.

31628427 is a deficient number, since it is larger than the sum of its proper divisors (12531573).

31628427 is a wasteful number, since it uses less digits than its factorization.

31628427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642.

The product of its digits is 16128, while the sum is 33.

The square root of 31628427 is about 5623.9156288124. The cubic root of 31628427 is about 316.2465995562.

The spelling of 31628427 in words is "thirty-one million, six hundred twenty-eight thousand, four hundred twenty-seven".