729721679 has 4 divisors (see below), whose sum is σ = 753261120. Its totient is φ = 706182240.

The previous prime is 729721669. The next prime is 729721757. The reversal of 729721679 is 976127927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 976127927 = 3323 ⋅293749.

It is a cyclic number.

It is not a de Polignac number, because 729721679 - 2¹⁶ = 729656143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729721639) 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, 11769674 + ... + 11769735.

It is an arithmetic number, because the mean of its divisors is an integer number (188315280).

Almost surely, 2^729721679 is an apocalyptic number.

729721679 is a deficient number, since it is larger than the sum of its proper divisors (23539441).

729721679 is a wasteful number, since it uses less digits than its factorization.

729721679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23539440.

The product of its digits is 666792, while the sum is 50.

The square root of 729721679 is about 27013.3611200087. The cubic root of 729721679 is about 900.2968892951.

The spelling of 729721679 in words is "seven hundred twenty-nine million, seven hundred twenty-one thousand, six hundred seventy-nine".