31728460 has 24 divisors (see below), whose sum is σ = 70549920. Its totient is φ = 11944704.

The previous prime is 31728457. The next prime is 31728467. The reversal of 31728460 is 6482713.

It is not an unprimeable number, because it can be changed into a prime (31728467) 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, 46320 + ... + 46999.

It is an arithmetic number, because the mean of its divisors is an integer number (2939580).

Almost surely, 2^31728460 is an apocalyptic number.

It is an amenable number.

31728460 is an abundant number, since it is smaller than the sum of its proper divisors (38821460).

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

31728460 is a wasteful number, since it uses less digits than its factorization.

31728460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93345 (or 93343 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 31728460 is about 5632.8021445813. The cubic root of 31728460 is about 316.5796523003.

The spelling of 31728460 in words is "thirty-one million, seven hundred twenty-eight thousand, four hundred sixty".