81825860304 has 60 divisors (see below), whose sum is σ = 229530255552. Its totient is φ = 27211982400.

The previous prime is 81825860273. The next prime is 81825860353. The reversal of 81825860304 is 40306852818.

81825860304 is a `hidden beast` number, since 8 + 18 + 25 + 8 + 603 + 0 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 81825860304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 597142 + ... + 721269.

Almost surely, 2^81825860304 is an apocalyptic number.

It is an amenable number.

81825860304 is an abundant number, since it is smaller than the sum of its proper divisors (147704395248).

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

81825860304 is a wasteful number, since it uses less digits than its factorization.

81825860304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318856 (or 1318847 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 81825860304 in words is "eighty-one billion, eight hundred twenty-five million, eight hundred sixty thousand, three hundred four".