87961568540 has 24 divisors (see below), whose sum is σ = 184815034992. Its totient is φ = 35166391040.

The previous prime is 87961568509. The next prime is 87961568557. The reversal of 87961568540 is 4586516978.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 87961568540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1100189 + ... + 1177428.

It is an arithmetic number, because the mean of its divisors is an integer number (7700626458).

Almost surely, 2^87961568540 is an apocalyptic number.

It is an amenable number.

87961568540 is an abundant number, since it is smaller than the sum of its proper divisors (96853466452).

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

87961568540 is a wasteful number, since it uses less digits than its factorization.

87961568540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279557 (or 2279555 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 59.

The spelling of 87961568540 in words is "eighty-seven billion, nine hundred sixty-one million, five hundred sixty-eight thousand, five hundred forty".