63920913 has 16 divisors (see below), whose sum is σ = 97637376. Its totient is φ = 36438480.

The previous prime is 63920911. The next prime is 63920929. The reversal of 63920913 is 31902936.

It is not a de Polignac number, because 63920913 - 2¹ = 63920911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63920911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5868 + ... + 12738.

It is an arithmetic number, because the mean of its divisors is an integer number (6102336).

Almost surely, 2^63920913 is an apocalyptic number.

It is an amenable number.

63920913 is a deficient number, since it is larger than the sum of its proper divisors (33716463).

63920913 is a wasteful number, since it uses less digits than its factorization.

63920913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7324.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 63920913 is about 7995.0555345163. The cubic root of 63920913 is about 399.8351675016.

The spelling of 63920913 in words is "sixty-three million, nine hundred twenty thousand, nine hundred thirteen".