63686993 has 4 divisors (see below), whose sum is σ = 67038960. Its totient is φ = 60335028.

The previous prime is 63686971. The next prime is 63687007. The reversal of 63686993 is 39968636.

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 63686993 - 2¹⁴ = 63670609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63686923) 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, 1675955 + ... + 1675992.

It is an arithmetic number, because the mean of its divisors is an integer number (16759740).

Almost surely, 2^63686993 is an apocalyptic number.

It is an amenable number.

63686993 is a deficient number, since it is larger than the sum of its proper divisors (3351967).

63686993 is a wasteful number, since it uses less digits than its factorization.

63686993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3351966.

The product of its digits is 1259712, while the sum is 50.

The square root of 63686993 is about 7980.4130845464. The cubic root of 63686993 is about 399.3468361062.

The spelling of 63686993 in words is "sixty-three million, six hundred eighty-six thousand, nine hundred ninety-three".