505428729 has 16 divisors (see below), whose sum is σ = 726147072. Its totient is φ = 310860288.

The previous prime is 505428727. The next prime is 505428739. The reversal of 505428729 is 927824505.

It is not a de Polignac number, because 505428729 - 2¹ = 505428727 is a prime.

It is not an unprimeable number, because it can be changed into a prime (505428727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137929 + ... + 141545.

It is an arithmetic number, because the mean of its divisors is an integer number (45384192).

Almost surely, 2^505428729 is an apocalyptic number.

It is an amenable number.

505428729 is a deficient number, since it is larger than the sum of its proper divisors (220718343).

505428729 is a wasteful number, since it uses less digits than its factorization.

505428729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7216.

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 505428729 is about 22481.7421255560. The cubic root of 505428729 is about 796.5627155168.

The spelling of 505428729 in words is "five hundred five million, four hundred twenty-eight thousand, seven hundred twenty-nine".