31323056 has 40 divisors (see below), whose sum is σ = 64710144. Its totient is φ = 14653760.

The previous prime is 31323023. The next prime is 31323107. The reversal of 31323056 is 65032313.

It is a super-2 number, since 2×31323056² = 1962267674358272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16391 + ... + 18201.

Almost surely, 2^31323056 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 31323056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32355072).

31323056 is an abundant number, since it is smaller than the sum of its proper divisors (33387088).

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

31323056 is a wasteful number, since it uses less digits than its factorization.

31323056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889 (or 1883 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 31323056 is about 5596.7004565190. The cubic root of 31323056 is about 315.2255242285.

Adding to 31323056 its reverse (65032313), we get a palindrome (96355369).

The spelling of 31323056 in words is "thirty-one million, three hundred twenty-three thousand, fifty-six".