81292208604 has 12 divisors (see below), whose sum is σ = 189681820104. Its totient is φ = 27097402864.

The previous prime is 81292208551. The next prime is 81292208609. The reversal of 81292208604 is 40680229218.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81292208609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3387175347 + ... + 3387175370.

It is an arithmetic number, because the mean of its divisors is an integer number (15806818342).

Almost surely, 2^81292208604 is an apocalyptic number.

It is an amenable number.

81292208604 is an abundant number, since it is smaller than the sum of its proper divisors (108389611500).

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

81292208604 is a wasteful number, since it uses less digits than its factorization.

81292208604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6774350724 (or 6774350722 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The spelling of 81292208604 in words is "eighty-one billion, two hundred ninety-two million, two hundred eight thousand, six hundred four".