31342736 has 40 divisors (see below), whose sum is σ = 64876800. Its totient is φ = 14636160.

The previous prime is 31342733. The next prime is 31342739. The reversal of 31342736 is 63724313.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31342733) and next prime (31342739).

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 31342699 and 31342708.

It is not an unprimeable number, because it can be changed into a prime (31342733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13295 + ... + 15473.

It is an arithmetic number, because the mean of its divisors is an integer number (1621920).

Almost surely, 2^31342736 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 31342736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32438400).

31342736 is an abundant number, since it is smaller than the sum of its proper divisors (33534064).

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

31342736 is a wasteful number, since it uses less digits than its factorization.

31342736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247 (or 2241 counting only the distinct ones).

The product of its digits is 9072, while the sum is 29.

The square root of 31342736 is about 5598.4583592271. The cubic root of 31342736 is about 315.2915282133.

The spelling of 31342736 in words is "thirty-one million, three hundred forty-two thousand, seven hundred thirty-six".