1878559887 has 12 divisors (see below), whose sum is σ = 2643515160. Its totient is φ = 1186458192.

The previous prime is 1878559871. The next prime is 1878559913. The reversal of 1878559887 is 7889558781.

It is not a de Polignac number, because 1878559887 - 2⁴ = 1878559871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1878559807) 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 11 ways as a sum of consecutive naturals, for example, 866212 + ... + 868377.

It is an arithmetic number, because the mean of its divisors is an integer number (220292930).

Almost surely, 2^1878559887 is an apocalyptic number.

1878559887 is a deficient number, since it is larger than the sum of its proper divisors (764955273).

1878559887 is a wasteful number, since it uses less digits than its factorization.

1878559887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734630 (or 1734611 counting only the distinct ones).

The product of its digits is 45158400, while the sum is 66.

The square root of 1878559887 is about 43342.3567310316. The cubic root of 1878559887 is about 1233.8859381363.

The spelling of 1878559887 in words is "one billion, eight hundred seventy-eight million, five hundred fifty-nine thousand, eight hundred eighty-seven".