729672979981 has 4 divisors (see below), whose sum is σ = 796006887264. Its totient is φ = 663339072700.

The previous prime is 729672979943. The next prime is 729672979993. The reversal of 729672979981 is 189979276927.

729672979981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-729672979981 is a prime.

It is a super-2 number, since 2×729672979981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 729672979898 and 729672979907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729672979181) 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, 33166953625 + ... + 33166953646.

It is an arithmetic number, because the mean of its divisors is an integer number (199001721816).

Almost surely, 2^729672979981 is an apocalyptic number.

It is an amenable number.

729672979981 is a deficient number, since it is larger than the sum of its proper divisors (66333907283).

729672979981 is a wasteful number, since it uses less digits than its factorization.

729672979981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66333907282.

The product of its digits is 432081216, while the sum is 76.

The spelling of 729672979981 in words is "seven hundred twenty-nine billion, six hundred seventy-two million, nine hundred seventy-nine thousand, nine hundred eighty-one".