31238328 has 96 divisors (see below), whose sum is σ = 88865280. Its totient is φ = 9134400.

The previous prime is 31238321. The next prime is 31238341. The reversal of 31238328 is 82383213.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 31238295 and 31238304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31238321) 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 23 ways as a sum of consecutive naturals, for example, 89851 + ... + 90197.

It is an arithmetic number, because the mean of its divisors is an integer number (925680).

Almost surely, 2^31238328 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 31238328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44432640).

31238328 is an abundant number, since it is smaller than the sum of its proper divisors (57626952).

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

31238328 is a wasteful number, since it uses less digits than its factorization.

31238328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 394 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 31238328 is about 5589.1258708317. The cubic root of 31238328 is about 314.9410421277.

The spelling of 31238328 in words is "thirty-one million, two hundred thirty-eight thousand, three hundred twenty-eight".