87885121840 has 40 divisors (see below), whose sum is σ = 204360388848. Its totient is φ = 35149320960.

The previous prime is 87885121811. The next prime is 87885121871. The reversal of 87885121840 is 4812158878.

It is a tau number, because it is divible by the number of its divisors (40).

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, 558295 + ... + 698185.

Almost surely, 2^87885121840 is an apocalyptic number.

87885121840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87885121840 is an abundant number, since it is smaller than the sum of its proper divisors (116475267008).

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

87885121840 is a wasteful number, since it uses less digits than its factorization.

87885121840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147757 (or 147751 counting only the distinct ones).

The product of its (nonzero) digits is 1146880, while the sum is 52.

The spelling of 87885121840 in words is "eighty-seven billion, eight hundred eighty-five million, one hundred twenty-one thousand, eight hundred forty".