987649778756 has 6 divisors (see below), whose sum is σ = 1728387112830. Its totient is φ = 493824889376.

The previous prime is 987649778747. The next prime is 987649778861. The reversal of 987649778756 is 657877946789.

It can be written as a sum of positive squares in only one way, i.e., 598503376900 + 389146401856 = 773630^2 + 623816^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123456222341 + ... + 123456222348.

It is an arithmetic number, because the mean of its divisors is an integer number (288064518805).

Almost surely, 2^987649778756 is an apocalyptic number.

It is an amenable number.

987649778756 is a deficient number, since it is larger than the sum of its proper divisors (740737334074).

987649778756 is a wasteful number, since it uses less digits than its factorization.

987649778756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246912444693 (or 246912444691 counting only the distinct ones).

The product of its digits is 8961684480, while the sum is 83.

The spelling of 987649778756 in words is "nine hundred eighty-seven billion, six hundred forty-nine million, seven hundred seventy-eight thousand, seven hundred fifty-six".