31123344 has 80 divisors (see below), whose sum is σ = 92533760. Its totient is φ = 8830080.

The previous prime is 31123343. The next prime is 31123361. The reversal of 31123344 is 44332113.

It is a Harshad number since it is a multiple of its sum of digits (21).

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

It is a self number, because there is not a number n which added to its sum of digits gives 31123344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123343) 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, 70677 + ... + 71115.

It is an arithmetic number, because the mean of its divisors is an integer number (1156672).

Almost surely, 2^31123344 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 31123344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46266880).

31123344 is an abundant number, since it is smaller than the sum of its proper divisors (61410416).

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

31123344 is a wasteful number, since it uses less digits than its factorization.

31123344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 662 counting only the distinct ones).

The product of its digits is 864, while the sum is 21.

The square root of 31123344 is about 5578.8299848624. The cubic root of 31123344 is about 314.5541487811.

Adding to 31123344 its reverse (44332113), we get a palindrome (75455457).

The spelling of 31123344 in words is "thirty-one million, one hundred twenty-three thousand, three hundred forty-four".