63840955 has 4 divisors (see below), whose sum is σ = 76609152. Its totient is φ = 51072760.

The previous prime is 63840949. The next prime is 63840971. The reversal of 63840955 is 55904836.

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

It is not a de Polignac number, because 63840955 - 2⁵ = 63840923 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6384091 + ... + 6384100.

It is an arithmetic number, because the mean of its divisors is an integer number (19152288).

Almost surely, 2^63840955 is an apocalyptic number.

63840955 is a deficient number, since it is larger than the sum of its proper divisors (12768197).

63840955 is a wasteful number, since it uses less digits than its factorization.

63840955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12768196.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 63840955 is about 7990.0535042013. The cubic root of 63840955 is about 399.6683813987.

The spelling of 63840955 in words is "sixty-three million, eight hundred forty thousand, nine hundred fifty-five".