63813893 has 12 divisors (see below), whose sum is σ = 75384288. Its totient is φ = 53548560.

The previous prime is 63813887. The next prime is 63813923. The reversal of 63813893 is 39831836.

It is not a de Polignac number, because 63813893 - 2⁶ = 63813829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63813893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63813823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15305 + ... + 19022.

It is an arithmetic number, because the mean of its divisors is an integer number (6282024).

Almost surely, 2^63813893 is an apocalyptic number.

It is an amenable number.

63813893 is a deficient number, since it is larger than the sum of its proper divisors (11570395).

63813893 is a wasteful number, since it uses less digits than its factorization.

63813893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34364 (or 34351 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 63813893 is about 7988.3598441733. The cubic root of 63813893 is about 399.6119006524.

The spelling of 63813893 in words is "sixty-three million, eight hundred thirteen thousand, eight hundred ninety-three".