81408487800 has 192 divisors, whose sum is σ = 260849063520. Its totient is φ = 20986767360.

The previous prime is 81408487733. The next prime is 81408487813. The reversal of 81408487800 is 878480418.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81408487800.

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 47 ways as a sum of consecutive naturals, for example, 3473722 + ... + 3497078.

Almost surely, 2^81408487800 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 81408487800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130424531760).

81408487800 is an abundant number, since it is smaller than the sum of its proper divisors (179440575720).

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

81408487800 is a wasteful number, since it uses less digits than its factorization.

81408487800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23570 (or 23561 counting only the distinct ones).

The product of its (nonzero) digits is 458752, while the sum is 48.

The spelling of 81408487800 in words is "eighty-one billion, four hundred eight million, four hundred eighty-seven thousand, eight hundred".