63891087 has 16 divisors (see below), whose sum is σ = 92692320. Its totient is φ = 38909952.

The previous prime is 63891073. The next prime is 63891101. The reversal of 63891087 is 78019836.

It is an interprime number because it is at equal distance from previous prime (63891073) and next prime (63891101).

It is not a de Polignac number, because 63891087 - 2⁸ = 63890831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63891017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4662 + ... + 12227.

It is an arithmetic number, because the mean of its divisors is an integer number (5793270).

Almost surely, 2^63891087 is an apocalyptic number.

63891087 is a deficient number, since it is larger than the sum of its proper divisors (28801233).

63891087 is a wasteful number, since it uses less digits than its factorization.

63891087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17002.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 63891087 is about 7993.1900390270. The cubic root of 63891087 is about 399.7729690835.

The spelling of 63891087 in words is "sixty-three million, eight hundred ninety-one thousand, eighty-seven".