81424908726 has 32 divisors (see below), whose sum is σ = 186469986048. Its totient is φ = 23219771040.

The previous prime is 81424908613. The next prime is 81424908737. The reversal of 81424908726 is 62780942418.

It is a super-2 number, since 2×81424908726² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1831465 + ... + 1875396.

It is an arithmetic number, because the mean of its divisors is an integer number (5827187064).

Almost surely, 2^81424908726 is an apocalyptic number.

81424908726 is an abundant number, since it is smaller than the sum of its proper divisors (105045077322).

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

81424908726 is a wasteful number, since it uses less digits than its factorization.

81424908726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707396.

The product of its (nonzero) digits is 1548288, while the sum is 51.

The spelling of 81424908726 in words is "eighty-one billion, four hundred twenty-four million, nine hundred eight thousand, seven hundred twenty-six".