64019887 has 4 divisors (see below), whose sum is σ = 64377720. Its totient is φ = 63662056.

The previous prime is 64019869. The next prime is 64019933. The reversal of 64019887 is 78891046.

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 64019887 - 2¹⁹ = 63495599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64019827) 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 3 ways as a sum of consecutive naturals, for example, 178648 + ... + 179005.

It is an arithmetic number, because the mean of its divisors is an integer number (16094430).

Almost surely, 2^64019887 is an apocalyptic number.

64019887 is a deficient number, since it is larger than the sum of its proper divisors (357833).

64019887 is a wasteful number, since it uses less digits than its factorization.

64019887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357832.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 64019887 is about 8001.2428409591. The cubic root of 64019887 is about 400.0414269594.

The spelling of 64019887 in words is "sixty-four million, nineteen thousand, eight hundred eighty-seven".