87172070571 has 12 divisors (see below), whose sum is σ = 125919003600. Its totient is φ = 58112964240.

The previous prime is 87172070567. The next prime is 87172070591. The reversal of 87172070571 is 17507027178.

It is a happy number.

87172070571 is a `hidden beast` number, since 8 + 7 + 1 + 7 + 2 + 0 + 70 + 571 = 666.

It is not a de Polignac number, because 87172070571 - 2² = 87172070567 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87172070521) 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, 217405 + ... + 470753.

It is an arithmetic number, because the mean of its divisors is an integer number (10493250300).

Almost surely, 2^87172070571 is an apocalyptic number.

87172070571 is a deficient number, since it is larger than the sum of its proper divisors (38746933029).

87172070571 is a wasteful number, since it uses less digits than its factorization.

87172070571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291586 (or 291583 counting only the distinct ones).

The product of its (nonzero) digits is 192080, while the sum is 45.

The spelling of 87172070571 in words is "eighty-seven billion, one hundred seventy-two million, seventy thousand, five hundred seventy-one".