87471999917478 has 24 divisors (see below), whose sum is σ = 206751999805416. Its totient is φ = 26506666641600.

The previous prime is 87471999917447. The next prime is 87471999917507.

87471999917478 is a `hidden beast` number, since 8 + 7 + 47 + 1 + 9 + 9 + 9 + 91 + 7 + 478 = 666.

87471999917478 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220888888483 + ... + 220888888878.

It is an arithmetic number, because the mean of its divisors is an integer number (8614666658559).

Almost surely, 2^{87471999917478} is an apocalyptic number.

87471999917478 is an abundant number, since it is smaller than the sum of its proper divisors (119279999887938).

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

87471999917478 is a wasteful number, since it uses less digits than its factorization.

87471999917478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441777777380 (or 441777777377 counting only the distinct ones).

The product of its digits is 16131032064, while the sum is 90.

The spelling of 87471999917478 in words is "eighty-seven trillion, four hundred seventy-one billion, nine hundred ninety-nine million, nine hundred seventeen thousand, four hundred seventy-eight".