987215297920 has 32 divisors (see below), whose sum is σ = 2360061573120. Its totient is φ = 394886118912.

The previous prime is 987215297903. The next prime is 987215297947. The reversal of 987215297920 is 29792512789.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771261312 + ... + 771262591.

It is an arithmetic number, because the mean of its divisors is an integer number (73751924160).

Almost surely, 2^987215297920 is an apocalyptic number.

It is an amenable number.

987215297920 is an abundant number, since it is smaller than the sum of its proper divisors (1372846275200).

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

987215297920 is a wasteful number, since it uses less digits than its factorization.

987215297920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542523922 (or 1542523910 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 61.

The spelling of 987215297920 in words is "nine hundred eighty-seven billion, two hundred fifteen million, two hundred ninety-seven thousand, nine hundred twenty".