31328248 has 48 divisors (see below), whose sum is σ = 68824080. Its totient is φ = 13368768.

The previous prime is 31328243. The next prime is 31328249. The reversal of 31328248 is 84282313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31328243) 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, 134340 + ... + 134572.

It is an arithmetic number, because the mean of its divisors is an integer number (1433835).

Almost surely, 2^31328248 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 31328248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34412040).

31328248 is an abundant number, since it is smaller than the sum of its proper divisors (37495832).

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

31328248 is an frugal number, since it uses more digits than its factorization.

31328248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 242 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 31328248 is about 5597.1642820271. The cubic root of 31328248 is about 315.2429401590.

It can be divided in two parts, 313 and 28248, that added together give a 4-th power (28561 = 13⁴).

The spelling of 31328248 in words is "thirty-one million, three hundred twenty-eight thousand, two hundred forty-eight".