31100328 has 128 divisors (see below), whose sum is σ = 100531200. Its totient is φ = 8724672.

The previous prime is 31100297. The next prime is 31100351. The reversal of 31100328 is 82300113.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 31100328.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 101151 + ... + 101457.

It is an arithmetic number, because the mean of its divisors is an integer number (785400).

Almost surely, 2^31100328 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 31100328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50265600).

31100328 is an abundant number, since it is smaller than the sum of its proper divisors (69430872).

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

31100328 is a wasteful number, since it uses less digits than its factorization.

31100328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 31100328 is about 5576.7668052376. The cubic root of 31100328 is about 314.4765910948.

The spelling of 31100328 in words is "thirty-one million, one hundred thousand, three hundred twenty-eight".