31280232 has 32 divisors (see below), whose sum is σ = 82317600. Its totient is φ = 9877824.

The previous prime is 31280231. The next prime is 31280267. The reversal of 31280232 is 23208213.

It is a junction number, because it is equal to n+sod(n) for n = 31280199 and 31280208.

It is not an unprimeable number, because it can be changed into a prime (31280231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33843 + ... + 34754.

It is an arithmetic number, because the mean of its divisors is an integer number (2572425).

Almost surely, 2^31280232 is an apocalyptic number.

It is an amenable number.

31280232 is an abundant number, since it is smaller than the sum of its proper divisors (51037368).

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

31280232 is a wasteful number, since it uses less digits than its factorization.

31280232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68625 (or 68621 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 31280232 is about 5592.8733223630. The cubic root of 31280232 is about 315.0818028917.

Adding to 31280232 its reverse (23208213), we get a palindrome (54488445).

The spelling of 31280232 in words is "thirty-one million, two hundred eighty thousand, two hundred thirty-two".