63821329 has 18 divisors (see below), whose sum is σ = 75986358. Its totient is φ = 53539200.

The previous prime is 63821321. The next prime is 63821333. The reversal of 63821329 is 92312836.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8690704 + 55130625 = 2948^2 + 7425^2 .

It is not a de Polignac number, because 63821329 - 2³ = 63821321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63821294 and 63821303.

It is not an unprimeable number, because it can be changed into a prime (63821321) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18889 + ... + 22009.

Almost surely, 2^63821329 is an apocalyptic number.

It is an amenable number.

63821329 is a deficient number, since it is larger than the sum of its proper divisors (12165029).

63821329 is a wasteful number, since it uses less digits than its factorization.

63821329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3169 (or 3145 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 63821329 is about 7988.8252578211. The cubic root of 63821329 is about 399.6274218215.

The spelling of 63821329 in words is "sixty-three million, eight hundred twenty-one thousand, three hundred twenty-nine".