728553505 has 16 divisors (see below), whose sum is σ = 894890880. Its totient is φ = 569248128.

The previous prime is 728553503. The next prime is 728553557. The reversal of 728553505 is 505355827.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 728553505 - 2¹ = 728553503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728553503) 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, 27906 + ... + 47284.

It is an arithmetic number, because the mean of its divisors is an integer number (55930680).

Almost surely, 2^728553505 is an apocalyptic number.

It is an amenable number.

728553505 is a deficient number, since it is larger than the sum of its proper divisors (166337375).

728553505 is a wasteful number, since it uses less digits than its factorization.

728553505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19560.

The product of its (nonzero) digits is 210000, while the sum is 40.

The square root of 728553505 is about 26991.7303076331. The cubic root of 728553505 is about 899.8162196762.

The spelling of 728553505 in words is "seven hundred twenty-eight million, five hundred fifty-three thousand, five hundred five".