81878424086 has 32 divisors (see below), whose sum is σ = 132628700160. Its totient is φ = 37794115744.

The previous prime is 81878424059. The next prime is 81878424101. The reversal of 81878424086 is 68042487818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3862031 + ... + 3883173.

It is an arithmetic number, because the mean of its divisors is an integer number (4144646880).

Almost surely, 2^81878424086 is an apocalyptic number.

81878424086 is a deficient number, since it is larger than the sum of its proper divisors (50750276074).

81878424086 is a wasteful number, since it uses less digits than its factorization.

81878424086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24100.

The product of its (nonzero) digits is 5505024, while the sum is 56.

The spelling of 81878424086 in words is "eighty-one billion, eight hundred seventy-eight million, four hundred twenty-four thousand, eighty-six".