31728016 has 10 divisors (see below), whose sum is σ = 61473062. Its totient is φ = 15864000.

The previous prime is 31728013. The next prime is 31728031. The reversal of 31728016 is 61082713.

It can be written as a sum of positive squares in only one way, i.e., 26419600 + 5308416 = 5140^2 + 2304^2 .

It is not an unprimeable number, because it can be changed into a prime (31728013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991485 + ... + 991516.

Almost surely, 2^31728016 is an apocalyptic number.

It is an amenable number.

31728016 is a deficient number, since it is larger than the sum of its proper divisors (29745046).

31728016 is a wasteful number, since it uses less digits than its factorization.

31728016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983009 (or 1983003 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 31728016 is about 5632.7627324431. The cubic root of 31728016 is about 316.5781755817.

The spelling of 31728016 in words is "thirty-one million, seven hundred twenty-eight thousand, sixteen".