63994993 has 4 divisors (see below), whose sum is σ = 66777408. Its totient is φ = 61212580.

The previous prime is 63994961. The next prime is 63995011. The reversal of 63994993 is 39949936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63994993 - 2⁵ = 63994961 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 63994993.

It is not an unprimeable number, because it can be changed into a prime (63994093) 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, 1391173 + ... + 1391218.

It is an arithmetic number, because the mean of its divisors is an integer number (16694352).

Almost surely, 2^63994993 is an apocalyptic number.

It is an amenable number.

63994993 is a deficient number, since it is larger than the sum of its proper divisors (2782415).

63994993 is a wasteful number, since it uses less digits than its factorization.

63994993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782414.

The product of its digits is 1417176, while the sum is 52.

The square root of 63994993 is about 7999.6870563791. The cubic root of 63994993 is about 399.9895684780.

The spelling of 63994993 in words is "sixty-three million, nine hundred ninety-four thousand, nine hundred ninety-three".