81238927248 has 120 divisors (see below), whose sum is σ = 230523183072. Its totient is φ = 26703650304.

The previous prime is 81238927219. The next prime is 81238927283. The reversal of 81238927248 is 84272983218.

81238927248 is a `hidden beast` number, since 8 + 12 + 389 + 2 + 7 + 248 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81238927194 and 81238927203.

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 23 ways as a sum of consecutive naturals, for example, 6722940 + ... + 6735012.

Almost surely, 2^81238927248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81238927248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115261591536).

81238927248 is an abundant number, since it is smaller than the sum of its proper divisors (149284255824).

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

81238927248 is a wasteful number, since it uses less digits than its factorization.

81238927248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12733 (or 12724 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The spelling of 81238927248 in words is "eighty-one billion, two hundred thirty-eight million, nine hundred twenty-seven thousand, two hundred forty-eight".