31730772 has 48 divisors (see below), whose sum is σ = 79168320. Its totient is φ = 9856512.

The previous prime is 31730771. The next prime is 31730773. The reversal of 31730772 is 27703713.

It is an interprime number because it is at equal distance from previous prime (31730771) and next prime (31730773).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31730771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21523 + ... + 22949.

It is an arithmetic number, because the mean of its divisors is an integer number (1649340).

Almost surely, 2^31730772 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 31730772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39584160).

31730772 is an abundant number, since it is smaller than the sum of its proper divisors (47437548).

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

31730772 is a wasteful number, since it uses less digits than its factorization.

31730772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1558 counting only the distinct ones).

The product of its (nonzero) digits is 6174, while the sum is 30.

The square root of 31730772 is about 5633.0073672950. The cubic root of 31730772 is about 316.5873416574.

The spelling of 31730772 in words is "thirty-one million, seven hundred thirty thousand, seven hundred seventy-two".