63893639 has 4 divisors (see below), whose sum is σ = 64058280. Its totient is φ = 63729000.

The previous prime is 63893623. The next prime is 63893653. The reversal of 63893639 is 93639836.

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

It is a cyclic number.

It is not a de Polignac number, because 63893639 - 2⁴ = 63893623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63893593 and 63893602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63893689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81737 + ... + 82514.

It is an arithmetic number, because the mean of its divisors is an integer number (16014570).

Almost surely, 2^63893639 is an apocalyptic number.

63893639 is a deficient number, since it is larger than the sum of its proper divisors (164641).

63893639 is a wasteful number, since it uses less digits than its factorization.

63893639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164640.

The product of its digits is 629856, while the sum is 47.

The square root of 63893639 is about 7993.3496733222. The cubic root of 63893639 is about 399.7782917196.

The spelling of 63893639 in words is "sixty-three million, eight hundred ninety-three thousand, six hundred thirty-nine".