729428643 has 6 divisors (see below), whose sum is σ = 1053619164. Its totient is φ = 486285756.

The previous prime is 729428633. The next prime is 729428669. The reversal of 729428643 is 346824927.

It is not a de Polignac number, because 729428643 - 2⁴ = 729428627 is a prime.

It is a super-2 number, since 2×729428643² = 1064132290457642898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (729428633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40523805 + ... + 40523822.

It is an arithmetic number, because the mean of its divisors is an integer number (175603194).

Almost surely, 2^729428643 is an apocalyptic number.

729428643 is a deficient number, since it is larger than the sum of its proper divisors (324190521).

729428643 is a wasteful number, since it uses less digits than its factorization.

729428643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81047633 (or 81047630 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 729428643 is about 27007.9366668392. The cubic root of 729428643 is about 900.1763617346.

It can be divided in two parts, 7294 and 28643, that added together give a cube (35937 = 33³).

The spelling of 729428643 in words is "seven hundred twenty-nine million, four hundred twenty-eight thousand, six hundred forty-three".