81074107760 has 40 divisors (see below), whose sum is σ = 188575738416. Its totient is φ = 32416148480.

The previous prime is 81074107747. The next prime is 81074107817. The reversal of 81074107760 is 6770147018.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16286 + ... + 403005.

Almost surely, 2^81074107760 is an apocalyptic number.

81074107760 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81074107760 is an abundant number, since it is smaller than the sum of its proper divisors (107501630656).

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

81074107760 is a wasteful number, since it uses less digits than its factorization.

81074107760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421721 (or 421715 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 41.

The spelling of 81074107760 in words is "eighty-one billion, seventy-four million, one hundred seven thousand, seven hundred sixty".