63990913 has 24 divisors (see below), whose sum is σ = 77775360. Its totient is φ = 52436160.

The previous prime is 63990833. The next prime is 63990929. The reversal of 63990913 is 31909936.

It is not a de Polignac number, because 63990913 - 2²¹ = 61893761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63990973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156253 + ... + 156661.

It is an arithmetic number, because the mean of its divisors is an integer number (3240640).

Almost surely, 2^63990913 is an apocalyptic number.

It is an amenable number.

63990913 is a deficient number, since it is larger than the sum of its proper divisors (13784447).

63990913 is a wasteful number, since it uses less digits than its factorization.

63990913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 63990913 is about 7999.4320423390. The cubic root of 63990913 is about 399.9810678539.

The spelling of 63990913 in words is "sixty-three million, nine hundred ninety thousand, nine hundred thirteen".