87981177975 has 24 divisors (see below), whose sum is σ = 149393630160. Its totient is φ = 45655096320.

The previous prime is 87981177959. The next prime is 87981177983. The reversal of 87981177975 is 57977118978.

It is not a de Polignac number, because 87981177975 - 2⁴ = 87981177959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15849690 + ... + 15855239.

It is an arithmetic number, because the mean of its divisors is an integer number (6224734590).

Almost surely, 2^87981177975 is an apocalyptic number.

87981177975 is a deficient number, since it is larger than the sum of its proper divisors (61412452185).

87981177975 is a wasteful number, since it uses less digits than its factorization.

87981177975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31704979 (or 31704974 counting only the distinct ones).

The product of its digits is 62233920, while the sum is 69.

The spelling of 87981177975 in words is "eighty-seven billion, nine hundred eighty-one million, one hundred seventy-seven thousand, nine hundred seventy-five".