31028028 has 48 divisors (see below), whose sum is σ = 75492480. Its totient is φ = 9906624.

The previous prime is 31028017. The next prime is 31028033. The reversal of 31028028 is 82082013.

It is a junction number, because it is equal to n+sod(n) for n = 31027989 and 31028007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56451 + ... + 56997.

It is an arithmetic number, because the mean of its divisors is an integer number (1572760).

Almost surely, 2^31028028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31028028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37746240).

31028028 is an abundant number, since it is smaller than the sum of its proper divisors (44464452).

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

31028028 is a wasteful number, since it uses less digits than its factorization.

31028028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746 (or 744 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 31028028 is about 5570.2807828690. The cubic root of 31028028 is about 314.2327105027.

The spelling of 31028028 in words is "thirty-one million, twenty-eight thousand, twenty-eight".