728216449 has 16 divisors (see below), whose sum is σ = 761156352. Its totient is φ = 696129408.

The previous prime is 728216441. The next prime is 728216459. The reversal of 728216449 is 944612827.

It is not a de Polignac number, because 728216449 - 2³ = 728216441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728216441) 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, 704437 + ... + 705469.

It is an arithmetic number, because the mean of its divisors is an integer number (47572272).

Almost surely, 2^728216449 is an apocalyptic number.

It is an amenable number.

728216449 is a deficient number, since it is larger than the sum of its proper divisors (32939903).

728216449 is a wasteful number, since it uses less digits than its factorization.

728216449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416.

The product of its digits is 193536, while the sum is 43.

The square root of 728216449 is about 26985.4858951993. The cubic root of 728216449 is about 899.6774354338.

The spelling of 728216449 in words is "seven hundred twenty-eight million, two hundred sixteen thousand, four hundred forty-nine".