31284428 has 12 divisors (see below), whose sum is σ = 62568912. Its totient is φ = 13407600.

The previous prime is 31284419. The next prime is 31284467. The reversal of 31284428 is 82448213.

31284428 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 31284394 and 31284403.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558623 + ... + 558678.

It is an arithmetic number, because the mean of its divisors is an integer number (5214076).

Almost surely, 2^31284428 is an apocalyptic number.

It is an amenable number.

31284428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31284428 is a wasteful number, since it uses less digits than its factorization.

31284428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117312 (or 1117310 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 31284428 is about 5593.2484300270. The cubic root of 31284428 is about 315.0958908534.

The spelling of 31284428 in words is "thirty-one million, two hundred eighty-four thousand, four hundred twenty-eight".