31103928 has 48 divisors (see below), whose sum is σ = 85007520. Its totient is φ = 10273536.

The previous prime is 31103911. The next prime is 31103929. The reversal of 31103928 is 82930113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6225 + ... + 10047.

It is an arithmetic number, because the mean of its divisors is an integer number (1770990).

Almost surely, 2^31103928 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 31103928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42503760).

31103928 is an abundant number, since it is smaller than the sum of its proper divisors (53903592).

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

31103928 is a wasteful number, since it uses less digits than its factorization.

31103928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3948 (or 3941 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 31103928 is about 5577.0895635627. The cubic root of 31103928 is about 314.4887246436.

The spelling of 31103928 in words is "thirty-one million, one hundred three thousand, nine hundred twenty-eight".