63967967 has 4 divisors (see below), whose sum is σ = 73106256. Its totient is φ = 54829680.

The previous prime is 63967963. The next prime is 63967993. The reversal of 63967967 is 76976936.

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 63967967 - 2² = 63967963 is a prime.

It is a super-2 number, since 2×63967967² = 8183801604226178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63967963) 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, 4569134 + ... + 4569147.

It is an arithmetic number, because the mean of its divisors is an integer number (18276564).

Almost surely, 2^63967967 is an apocalyptic number.

63967967 is a deficient number, since it is larger than the sum of its proper divisors (9138289).

63967967 is an equidigital number, since it uses as much as digits as its factorization.

63967967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9138288.

The product of its digits is 2571912, while the sum is 53.

The square root of 63967967 is about 7997.9976869214. The cubic root of 63967967 is about 399.9332534462.

The spelling of 63967967 in words is "sixty-three million, nine hundred sixty-seven thousand, nine hundred sixty-seven".