987661880 has 32 divisors (see below), whose sum is σ = 2236407840. Its totient is φ = 392545920.

The previous prime is 987661853. The next prime is 987661897. The reversal of 987661880 is 88166789.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72356 + ... + 84915.

It is an arithmetic number, because the mean of its divisors is an integer number (69887745).

Almost surely, 2^987661880 is an apocalyptic number.

It is an amenable number.

987661880 is an abundant number, since it is smaller than the sum of its proper divisors (1248745960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

987661880 is a wasteful number, since it uses less digits than its factorization.

987661880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157439 (or 157435 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 53.

The square root of 987661880 is about 31427.0883156553. The cubic root of 987661880 is about 995.8702620752.

The spelling of 987661880 in words is "nine hundred eighty-seven million, six hundred sixty-one thousand, eight hundred eighty".