32721472 has 28 divisors (see below), whose sum is σ = 74208640. Its totient is φ = 14023296.

The previous prime is 32721463. The next prime is 32721499. The reversal of 32721472 is 27412723.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 32721472.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 36072 + ... + 36967.

Almost surely, 2^32721472 is an apocalyptic number.

32721472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

32721472 is an abundant number, since it is smaller than the sum of its proper divisors (41487168).

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

32721472 is an equidigital number, since it uses as much as digits as its factorization.

32721472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73058 (or 73048 counting only the distinct ones).

The product of its digits is 4704, while the sum is 28.

The square root of 32721472 is about 5720.2685251656. The cubic root of 32721472 is about 319.8484699237.

The spelling of 32721472 in words is "thirty-two million, seven hundred twenty-one thousand, four hundred seventy-two".