81864407702 has 96 divisors (see below), whose sum is σ = 164287388160. Its totient is φ = 30193067520.

The previous prime is 81864407663. The next prime is 81864407753. The reversal of 81864407702 is 20770446818.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2387999 + ... + 2422037.

It is an arithmetic number, because the mean of its divisors is an integer number (1711326960).

Almost surely, 2^81864407702 is an apocalyptic number.

81864407702 is an abundant number, since it is smaller than the sum of its proper divisors (82422980458).

81864407702 is a wasteful number, since it uses less digits than its factorization.

81864407702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34186 (or 34179 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 47.

The spelling of 81864407702 in words is "eighty-one billion, eight hundred sixty-four million, four hundred seven thousand, seven hundred two".