729136819 has 4 divisors (see below), whose sum is σ = 729479520. Its totient is φ = 728794120.

The previous prime is 729136781. The next prime is 729136831. The reversal of 729136819 is 918631927.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-729136819 is a prime.

It is a super-2 number, since 2×729136819² = 1063281001642877522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (729136019) 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, 168139 + ... + 172420.

It is an arithmetic number, because the mean of its divisors is an integer number (182369880).

Almost surely, 2^729136819 is an apocalyptic number.

729136819 is a deficient number, since it is larger than the sum of its proper divisors (342701).

729136819 is a wasteful number, since it uses less digits than its factorization.

729136819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342700.

The product of its digits is 163296, while the sum is 46.

The square root of 729136819 is about 27002.5335663156. The cubic root of 729136819 is about 900.0563005932.

The spelling of 729136819 in words is "seven hundred twenty-nine million, one hundred thirty-six thousand, eight hundred nineteen".