352628721 has 12 divisors (see below), whose sum is σ = 528217872. Its totient is φ = 235085652.

The previous prime is 352628711. The next prime is 352628743. The reversal of 352628721 is 127826253.

352628721 is a `hidden beast` number, since 3 + 5 + 2 + 628 + 7 + 21 = 666.

It is not a de Polignac number, because 352628721 - 2⁹ = 352628209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (352628711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 725331 + ... + 725816.

It is an arithmetic number, because the mean of its divisors is an integer number (44018156).

Almost surely, 2^352628721 is an apocalyptic number.

It is an amenable number.

352628721 is a deficient number, since it is larger than the sum of its proper divisors (175589151).

352628721 is an equidigital number, since it uses as much as digits as its factorization.

352628721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451162 (or 1451150 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 352628721 is about 18778.4110350157. The cubic root of 352628721 is about 706.4897965990.

The spelling of 352628721 in words is "three hundred fifty-two million, six hundred twenty-eight thousand, seven hundred twenty-one".