81200004700 has 18 divisors (see below), whose sum is σ = 176204010416. Its totient is φ = 32480001840.

The previous prime is 81200004689. The next prime is 81200004703. The reversal of 81200004700 is 740000218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81200004703) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 405999924 + ... + 406000123.

Almost surely, 2^81200004700 is an apocalyptic number.

It is an amenable number.

81200004700 is an abundant number, since it is smaller than the sum of its proper divisors (95004005716).

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

81200004700 is a wasteful number, since it uses less digits than its factorization.

81200004700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812000061 (or 812000054 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 81200004700 its reverse (740000218), we get a palindrome (81940004918).

The spelling of 81200004700 in words is "eighty-one billion, two hundred million, four thousand, seven hundred".