81738739800 has 144 divisors (see below), whose sum is σ = 281201455080. Its totient is φ = 21265344000.

The previous prime is 81738739787. The next prime is 81738739811. The reversal of 81738739800 is 893783718.

81738739800 is a `hidden beast` number, since 8 + 173 + 87 + 398 + 0 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 479986 + ... + 627585.

Almost surely, 2^81738739800 is an apocalyptic number.

It is an amenable number.

81738739800 is an abundant number, since it is smaller than the sum of its proper divisors (199462715280).

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

81738739800 is a wasteful number, since it uses less digits than its factorization.

81738739800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107634 (or 1107622 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 81738739800 in words is "eighty-one billion, seven hundred thirty-eight million, seven hundred thirty-nine thousand, eight hundred".