213628733 has 4 divisors (see below), whose sum is σ = 216555228. Its totient is φ = 210702240.

The previous prime is 213628729. The next prime is 213628741. The reversal of 213628733 is 337826312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 135536164 + 78092569 = 11642^2 + 8837^2 .

It is a cyclic number.

It is not a de Polignac number, because 213628733 - 2² = 213628729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213628693 and 213628702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213628133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1463138 + ... + 1463283.

It is an arithmetic number, because the mean of its divisors is an integer number (54138807).

Almost surely, 2^213628733 is an apocalyptic number.

It is an amenable number.

213628733 is a deficient number, since it is larger than the sum of its proper divisors (2926495).

213628733 is an equidigital number, since it uses as much as digits as its factorization.

213628733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926494.

The product of its digits is 36288, while the sum is 35.

The square root of 213628733 is about 14616.0436849375. The cubic root of 213628733 is about 597.7962984826.

The spelling of 213628733 in words is "two hundred thirteen million, six hundred twenty-eight thousand, seven hundred thirty-three".