987649778760 has 128 divisors (see below), whose sum is σ = 3026645637120. Its totient is φ = 257713809152.

The previous prime is 987649778747. The next prime is 987649778861. The reversal of 987649778760 is 67877946789.

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, 30366427 + ... + 30398933.

It is an arithmetic number, because the mean of its divisors is an integer number (23645669040).

Almost surely, 2^987649778760 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 987649778760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1513322818560).

987649778760 is an abundant number, since it is smaller than the sum of its proper divisors (2038995858360).

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

987649778760 is a wasteful number, since it uses less digits than its factorization.

987649778760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37955 (or 37951 counting only the distinct ones).

The product of its (nonzero) digits is 1792336896, while the sum is 78.

The spelling of 987649778760 in words is "nine hundred eighty-seven billion, six hundred forty-nine million, seven hundred seventy-eight thousand, seven hundred sixty".