987687390 has 64 divisors (see below), whose sum is σ = 2508475392. Its totient is φ = 248371200.

The previous prime is 987687377. The next prime is 987687419. The reversal of 987687390 is 93786789.

It is a self number, because there is not a number n which added to its sum of digits gives 987687390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38910 + ... + 59070.

It is an arithmetic number, because the mean of its divisors is an integer number (39194928).

Almost surely, 2^987687390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 987687390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1254237696).

987687390 is an abundant number, since it is smaller than the sum of its proper divisors (1520788002).

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

987687390 is a wasteful number, since it uses less digits than its factorization.

987687390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20265.

The product of its (nonzero) digits is 4572288, while the sum is 57.

The square root of 987687390 is about 31427.4941730963. The cubic root of 987687390 is about 995.8788360053.

The spelling of 987687390 in words is "nine hundred eighty-seven million, six hundred eighty-seven thousand, three hundred ninety".