987780 has 48 divisors (see below), whose sum is σ = 2810304. Its totient is φ = 259200.

The previous prime is 987739. The next prime is 987793. The reversal of 987780 is 87789.

It is an unprimeable number.

987780 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5979 + ... + 6141.

It is an arithmetic number, because the mean of its divisors is an integer number (58548).

2⁹⁸⁷⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 987780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1405152).

987780 is an abundant number, since it is smaller than the sum of its proper divisors (1822524).

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

987780 is a wasteful number, since it uses less digits than its factorization.

987780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 987780 is about 993.8712190219. The cubic root of 987780 is about 99.5909961055.

The spelling of 987780 in words is "nine hundred eighty-seven thousand, seven hundred eighty".