213991328 has 12 divisors (see below), whose sum is σ = 421295490. Its totient is φ = 106995648.

The previous prime is 213991303. The next prime is 213991331. The reversal of 213991328 is 823199312.

It can be written as a sum of positive squares in only one way, i.e., 211644304 + 2347024 = 14548^2 + 1532^2 .

It is a junction number, because it is equal to n+sod(n) for n = 213991291 and 213991300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343583 + ... + 3343646.

Almost surely, 2^213991328 is an apocalyptic number.

It is an amenable number.

213991328 is a deficient number, since it is larger than the sum of its proper divisors (207304162).

213991328 is an equidigital number, since it uses as much as digits as its factorization.

213991328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6687239 (or 6687231 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 213991328 is about 14628.4424324670. The cubic root of 213991328 is about 598.1343232821.

The spelling of 213991328 in words is "two hundred thirteen million, nine hundred ninety-one thousand, three hundred twenty-eight".