31396288 has 112 divisors (see below), whose sum is σ = 81345024. Its totient is φ = 11658240.

The previous prime is 31396279. The next prime is 31396289. The reversal of 31396288 is 88269313.

It is a tau number, because it is divible by the number of its divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 31396288.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31396289) 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, 113206 + ... + 113482.

Almost surely, 2^31396288 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 31396288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40672512).

31396288 is an abundant number, since it is smaller than the sum of its proper divisors (49948736).

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

31396288 is a wasteful number, since it uses less digits than its factorization.

31396288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 320 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 31396288 is about 5603.2390632562. The cubic root of 31396288 is about 315.4709944092.

It can be divided in two parts, 31396 and 288, that added together give a square (31684 = 178²).

The spelling of 31396288 in words is "thirty-one million, three hundred ninety-six thousand, two hundred eighty-eight".