63728213 has 2 divisors, whose sum is σ = 63728214. Its totient is φ = 63728212.

The previous prime is 63728143. The next prime is 63728243. The reversal of 63728213 is 31282736.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58629649 + 5098564 = 7657^2 + 2258^2 .

It is a cyclic number.

It is not a de Polignac number, because 63728213 - 2¹² = 63724117 is a prime.

It is a super-2 number, since 2×63728213² = 8122570264346738, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63728213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63728243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31864106 + 31864107.

It is an arithmetic number, because the mean of its divisors is an integer number (31864107).

Almost surely, 2^63728213 is an apocalyptic number.

It is an amenable number.

63728213 is a deficient number, since it is larger than the sum of its proper divisors (1).

63728213 is an equidigital number, since it uses as much as digits as its factorization.

63728213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 63728213 is about 7982.9952398833. The cubic root of 63728213 is about 399.4329736660.

The spelling of 63728213 in words is "sixty-three million, seven hundred twenty-eight thousand, two hundred thirteen".