729545985 has 48 divisors (see below), whose sum is σ = 1475974656. Its totient is φ = 326404224.

The previous prime is 729545981. The next prime is 729545987. The reversal of 729545985 is 589545927.

729545985 is a `hidden beast` number, since 7 + 2 + 9 + 545 + 98 + 5 = 666.

It is not a de Polignac number, because 729545985 - 2² = 729545981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (729545981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9834 + ... + 39443.

It is an arithmetic number, because the mean of its divisors is an integer number (30749472).

Almost surely, 2^729545985 is an apocalyptic number.

It is an amenable number.

729545985 is an abundant number, since it is smaller than the sum of its proper divisors (746428671).

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

729545985 is a wasteful number, since it uses less digits than its factorization.

729545985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49342 (or 49339 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 54.

The square root of 729545985 is about 27010.1089409132. The cubic root of 729545985 is about 900.2246291158.

The spelling of 729545985 in words is "seven hundred twenty-nine million, five hundred forty-five thousand, nine hundred eighty-five".