31330044 has 48 divisors (see below), whose sum is σ = 81849600. Its totient is φ = 10363248.

The previous prime is 31330043. The next prime is 31330073. The reversal of 31330044 is 44003313.

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

It is a junction number, because it is equal to n+sod(n) for n = 31329999 and 31330026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31330043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13969 + ... + 16055.

It is an arithmetic number, because the mean of its divisors is an integer number (1705200).

Almost surely, 2^31330044 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 31330044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40924800).

31330044 is an abundant number, since it is smaller than the sum of its proper divisors (50519556).

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

31330044 is a wasteful number, since it uses less digits than its factorization.

31330044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239 (or 2231 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 31330044 is about 5597.3247181131. The cubic root of 31330044 is about 315.2489641740.

Adding to 31330044 its reverse (44003313), we get a palindrome (75333357).

The spelling of 31330044 in words is "thirty-one million, three hundred thirty thousand, forty-four".