32721330 has 16 divisors (see below), whose sum is σ = 78531264. Its totient is φ = 8725680.

The previous prime is 32721329. The next prime is 32721343. The reversal of 32721330 is 3312723.

It is a junction number, because it is equal to n+sod(n) for n = 32721297 and 32721306.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545326 + ... + 545385.

It is an arithmetic number, because the mean of its divisors is an integer number (4908204).

Almost surely, 2^32721330 is an apocalyptic number.

32721330 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

32721330 is an abundant number, since it is smaller than the sum of its proper divisors (45809934).

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

32721330 is a wasteful number, since it uses less digits than its factorization.

32721330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090721.

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 32721330 is about 5720.2561131474. The cubic root of 32721330 is about 319.8480072454.

The spelling of 32721330 in words is "thirty-two million, seven hundred twenty-one thousand, three hundred thirty".