871989890 has 8 divisors (see below), whose sum is σ = 1569581820. Its totient is φ = 348795952.

The previous prime is 871989829. The next prime is 871989907. The reversal of 871989890 is 98989178.

It can be written as a sum of positive squares in 2 ways, for example, as 722588161 + 149401729 = 26881^2 + 12223^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43599485 + ... + 43599504.

Almost surely, 2^871989890 is an apocalyptic number.

871989890 is a deficient number, since it is larger than the sum of its proper divisors (697591930).

871989890 is a wasteful number, since it uses less digits than its factorization.

871989890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87198996.

The product of its (nonzero) digits is 2612736, while the sum is 59.

The square root of 871989890 is about 29529.4749360702. The cubic root of 871989890 is about 955.3675439897.

The spelling of 871989890 in words is "eight hundred seventy-one million, nine hundred eighty-nine thousand, eight hundred ninety".