81814789008 has 60 divisors (see below), whose sum is σ = 228992956608. Its totient is φ = 27268597440.

The previous prime is 81814788943. The next prime is 81814789057. The reversal of 81814789008 is 80098741818.

It is a happy number.

81814789008 is a `hidden beast` number, since 8 + 1 + 81 + 478 + 90 + 0 + 8 = 666.

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, 1565053 + ... + 1616483.

Almost surely, 2^81814789008 is an apocalyptic number.

It is an amenable number.

81814789008 is an abundant number, since it is smaller than the sum of its proper divisors (147178167600).

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

81814789008 is a wasteful number, since it uses less digits than its factorization.

81814789008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62492 (or 62483 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 54.

The spelling of 81814789008 in words is "eighty-one billion, eight hundred fourteen million, seven hundred eighty-nine thousand, eight".