31340036 has 72 divisors (see below), whose sum is σ = 70096320. Its totient is φ = 11995776.

The previous prime is 31340009. The next prime is 31340051. The reversal of 31340036 is 63004313.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174995 + ... + 175173.

It is an arithmetic number, because the mean of its divisors is an integer number (973560).

Almost surely, 2^31340036 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 31340036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35048160).

31340036 is an abundant number, since it is smaller than the sum of its proper divisors (38756284).

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

31340036 is a wasteful number, since it uses less digits than its factorization.

31340036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 31340036 is about 5598.2172162216. The cubic root of 31340036 is about 315.2824744242.

Adding to 31340036 its reverse (63004313), we get a palindrome (94344349).

The spelling of 31340036 in words is "thirty-one million, three hundred forty thousand, thirty-six".