81767405604 has 24 divisors (see below), whose sum is σ = 191588906880. Its totient is φ = 27141759904.

The previous prime is 81767405591. The next prime is 81767405609. The reversal of 81767405604 is 40650476718.

It is not an unprimeable number, because it can be changed into a prime (81767405609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14252259 + ... + 14257994.

It is an arithmetic number, because the mean of its divisors is an integer number (7982871120).

Almost surely, 2^81767405604 is an apocalyptic number.

It is an amenable number.

81767405604 is an abundant number, since it is smaller than the sum of its proper divisors (109821501276).

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

81767405604 is a wasteful number, since it uses less digits than its factorization.

81767405604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28510499 (or 28510497 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 81767405604 in words is "eighty-one billion, seven hundred sixty-seven million, four hundred five thousand, six hundred four".