63993697 has 4 divisors (see below), whose sum is σ = 65042836. Its totient is φ = 62944560.

The previous prime is 63993689. The next prime is 63993719. The reversal of 63993697 is 79639936.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23658496 + 40335201 = 4864^2 + 6351^2 .

It is a cyclic number.

It is not a de Polignac number, because 63993697 - 2³ = 63993689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63993607) 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, 524478 + ... + 524599.

It is an arithmetic number, because the mean of its divisors is an integer number (16260709).

Almost surely, 2^63993697 is an apocalyptic number.

It is an amenable number.

63993697 is a deficient number, since it is larger than the sum of its proper divisors (1049139).

63993697 is a wasteful number, since it uses less digits than its factorization.

63993697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049138.

The product of its digits is 1653372, while the sum is 52.

The square root of 63993697 is about 7999.6060528004. The cubic root of 63993697 is about 399.9868683189.

The spelling of 63993697 in words is "sixty-three million, nine hundred ninety-three thousand, six hundred ninety-seven".