31008428 has 18 divisors (see below), whose sum is σ = 59647308. Its totient is φ = 14094520.

The previous prime is 31008421. The next prime is 31008431. The reversal of 31008428 is 82480013.

It is a junction number, because it is equal to n+sod(n) for n = 31008397 and 31008406.

It is not an unprimeable number, because it can be changed into a prime (31008421) 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 5 ways as a sum of consecutive naturals, for example, 31550 + ... + 32517.

Almost surely, 2^31008428 is an apocalyptic number.

It is an amenable number.

31008428 is a deficient number, since it is larger than the sum of its proper divisors (28638880).

31008428 is a wasteful number, since it uses less digits than its factorization.

31008428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64093 (or 64080 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 31008428 is about 5568.5211681379. The cubic root of 31008428 is about 314.1665309996.

The spelling of 31008428 in words is "thirty-one million, eight thousand, four hundred twenty-eight".