81808027392 has 432 divisors, whose sum is σ = 271950766080. Its totient is φ = 21375664128.

The previous prime is 81808027387. The next prime is 81808027423. The reversal of 81808027392 is 29372080818.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115384734 + ... + 115385442.

Almost surely, 2^81808027392 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 81808027392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135975383040).

81808027392 is an abundant number, since it is smaller than the sum of its proper divisors (190142738688).

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

81808027392 is a wasteful number, since it uses less digits than its factorization.

81808027392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 81808027392 in words is "eighty-one billion, eight hundred eight million, twenty-seven thousand, three hundred ninety-two".