81238926908 has 12 divisors (see below), whose sum is σ = 142373869512. Its totient is φ = 40560678480.

The previous prime is 81238926893. The next prime is 81238926947. The reversal of 81238926908 is 80962983218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14693135 + ... + 14698662.

It is an arithmetic number, because the mean of its divisors is an integer number (11864489126).

Almost surely, 2^81238926908 is an apocalyptic number.

It is an amenable number.

81238926908 is a deficient number, since it is larger than the sum of its proper divisors (61134942604).

81238926908 is a wasteful number, since it uses less digits than its factorization.

81238926908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29392492 (or 29392490 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 56.

The spelling of 81238926908 in words is "eighty-one billion, two hundred thirty-eight million, nine hundred twenty-six thousand, nine hundred eight".