63978907 has 4 divisors (see below), whose sum is σ = 64032696. Its totient is φ = 63925120.

The previous prime is 63978899. The next prime is 63978911. The reversal of 63978907 is 70987936.

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 63978907 - 2³ = 63978899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63978307) 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, 25069 + ... + 27502.

It is an arithmetic number, because the mean of its divisors is an integer number (16008174).

Almost surely, 2^63978907 is an apocalyptic number.

63978907 is a deficient number, since it is larger than the sum of its proper divisors (53789).

63978907 is a wasteful number, since it uses less digits than its factorization.

63978907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53788.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 63978907 is about 7998.6815788604. The cubic root of 63978907 is about 399.9560514215.

The spelling of 63978907 in words is "sixty-three million, nine hundred seventy-eight thousand, nine hundred seven".