84471717987 has 12 divisors (see below), whose sum is σ = 123559194720. Its totient is φ = 55601636688.

The previous prime is 84471717983. The next prime is 84471717989. The reversal of 84471717987 is 78971717448.

84471717987 is a `hidden beast` number, since 8 + 4 + 471 + 71 + 7 + 98 + 7 = 666.

It is not a de Polignac number, because 84471717987 - 2² = 84471717983 is a prime.

It is a super-2 number, since 2×84471717987² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (84471717983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59402748 + ... + 59404169.

It is an arithmetic number, because the mean of its divisors is an integer number (10296599560).

Almost surely, 2^84471717987 is an apocalyptic number.

84471717987 is a deficient number, since it is larger than the sum of its proper divisors (39087476733).

84471717987 is a wasteful number, since it uses less digits than its factorization.

84471717987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118807002 (or 118806999 counting only the distinct ones).

The product of its digits is 22127616, while the sum is 63.

The spelling of 84471717987 in words is "eighty-four billion, four hundred seventy-one million, seven hundred seventeen thousand, nine hundred eighty-seven".