63891963 has 8 divisors (see below), whose sum is σ = 94654800. Its totient is φ = 42594624.

The previous prime is 63891931. The next prime is 63891991. The reversal of 63891963 is 36919836.

63891963 is a `hidden beast` number, since 638 + 9 + 1 + 9 + 6 + 3 = 666.

It is not a de Polignac number, because 63891963 - 2⁵ = 63891931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63891913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1183158 + ... + 1183211.

It is an arithmetic number, because the mean of its divisors is an integer number (11831850).

Almost surely, 2^63891963 is an apocalyptic number.

63891963 is a deficient number, since it is larger than the sum of its proper divisors (30762837).

63891963 is a wasteful number, since it uses less digits than its factorization.

63891963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366378 (or 2366372 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 63891963 is about 7993.2448354845. The cubic root of 63891963 is about 399.7747961485.

The spelling of 63891963 in words is "sixty-three million, eight hundred ninety-one thousand, nine hundred sixty-three".