31280472 has 32 divisors (see below), whose sum is σ = 86890800. Its totient is φ = 10426752.

The previous prime is 31280471. The next prime is 31280489. The reversal of 31280472 is 27408213.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31280471) 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, 72193 + ... + 72624.

Almost surely, 2^31280472 is an apocalyptic number.

It is an amenable number.

31280472 is an abundant number, since it is smaller than the sum of its proper divisors (55610328).

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

31280472 is a wasteful number, since it uses less digits than its factorization.

31280472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144832 (or 144822 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 31280472 is about 5592.8947781985. The cubic root of 31280472 is about 315.0826087195.

Adding to 31280472 its reverse (27408213), we get a palindrome (58688685).

The spelling of 31280472 in words is "thirty-one million, two hundred eighty thousand, four hundred seventy-two".