987649831556 has 12 divisors (see below), whose sum is σ = 1728423977280. Its totient is φ = 493814409480.

The previous prime is 987649831543. The next prime is 987649831573. The reversal of 987649831556 is 655138946789.

It is a happy number.

It is a super-2 number, since 2×987649831556² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 987649831556.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2413136 + ... + 2792583.

It is an arithmetic number, because the mean of its divisors is an integer number (144035331440).

Almost surely, 2^987649831556 is an apocalyptic number.

It is an amenable number.

987649831556 is a deficient number, since it is larger than the sum of its proper divisors (740774145724).

987649831556 is a wasteful number, since it uses less digits than its factorization.

987649831556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253154 (or 5253152 counting only the distinct ones).

The product of its digits is 391910400, while the sum is 71.

The spelling of 987649831556 in words is "nine hundred eighty-seven billion, six hundred forty-nine million, eight hundred thirty-one thousand, five hundred fifty-six".