81876382687 has 8 divisors (see below), whose sum is σ = 89334519120. Its totient is φ = 74420717760.

The previous prime is 81876382667. The next prime is 81876382697. The reversal of 81876382687 is 78628367818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81876382687 - 2¹⁹ = 81875858399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81876382667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548262 + ... + 681427.

It is an arithmetic number, because the mean of its divisors is an integer number (11166814890).

Almost surely, 2^81876382687 is an apocalyptic number.

81876382687 is a deficient number, since it is larger than the sum of its proper divisors (7458136433).

81876382687 is a wasteful number, since it uses less digits than its factorization.

81876382687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235753.

The product of its digits is 43352064, while the sum is 64.

The spelling of 81876382687 in words is "eighty-one billion, eight hundred seventy-six million, three hundred eighty-two thousand, six hundred eighty-seven".