729231217812 has 18 divisors (see below), whose sum is σ = 1843334467338. Its totient is φ = 243077072592.

The previous prime is 729231217777. The next prime is 729231217837. The reversal of 729231217812 is 218712132927.

729231217812 is a `hidden beast` number, since 72 + 92 + 312 + 178 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 719976008196 + 9255209616 = 848514^2 + 96204^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10128211323 + ... + 10128211394.

Almost surely, 2^729231217812 is an apocalyptic number.

It is an amenable number.

729231217812 is an abundant number, since it is smaller than the sum of its proper divisors (1114103249526).

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

729231217812 is a wasteful number, since it uses less digits than its factorization.

729231217812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20256422727 (or 20256422722 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The spelling of 729231217812 in words is "seven hundred twenty-nine billion, two hundred thirty-one million, two hundred seventeen thousand, eight hundred twelve".