31472728 has 32 divisors (see below), whose sum is σ = 67629600. Its totient is φ = 13450752.

The previous prime is 31472723. The next prime is 31472773. The reversal of 31472728 is 82727413.

It is a junction number, because it is equal to n+sod(n) for n = 31472693 and 31472702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31472723) 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 7 ways as a sum of consecutive naturals, for example, 30688 + ... + 31696.

It is an arithmetic number, because the mean of its divisors is an integer number (2113425).

Almost surely, 2^31472728 is an apocalyptic number.

It is an amenable number.

31472728 is an abundant number, since it is smaller than the sum of its proper divisors (36156872).

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

31472728 is a wasteful number, since it uses less digits than its factorization.

31472728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579 (or 1575 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 31472728 is about 5610.0559712003. The cubic root of 31472728 is about 315.7268108374.

The spelling of 31472728 in words is "thirty-one million, four hundred seventy-two thousand, seven hundred twenty-eight".