662678213 has 4 divisors (see below), whose sum is σ = 663536268. Its totient is φ = 661820160.

The previous prime is 662678209. The next prime is 662678221. The reversal of 662678213 is 312876266.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312876266 = 2 ⋅156438133.

It can be written as a sum of positive squares in 2 ways, for example, as 318872449 + 343805764 = 17857^2 + 18542^2 .

It is a cyclic number.

It is not a de Polignac number, because 662678213 - 2² = 662678209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662678273) 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, 427868 + ... + 429413.

It is an arithmetic number, because the mean of its divisors is an integer number (165884067).

Almost surely, 2^662678213 is an apocalyptic number.

It is an amenable number.

662678213 is a deficient number, since it is larger than the sum of its proper divisors (858055).

662678213 is an equidigital number, since it uses as much as digits as its factorization.

662678213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858054.

The product of its digits is 145152, while the sum is 41.

The square root of 662678213 is about 25742.5370350321. The cubic root of 662678213 is about 871.8348613614.

The spelling of 662678213 in words is "six hundred sixty-two million, six hundred seventy-eight thousand, two hundred thirteen".