728495447 has 4 divisors (see below), whose sum is σ = 728549640. Its totient is φ = 728441256.

The previous prime is 728495401. The next prime is 728495461. The reversal of 728495447 is 744594827.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 744594827 = 53 ⋅14048959.

It is a cyclic number.

It is not a de Polignac number, because 728495447 - 2⁸ = 728495191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728495395 and 728495404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728495947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9968 + ... + 39450.

It is an arithmetic number, because the mean of its divisors is an integer number (182137410).

Almost surely, 2^728495447 is an apocalyptic number.

728495447 is a deficient number, since it is larger than the sum of its proper divisors (54193).

728495447 is a wasteful number, since it uses less digits than its factorization.

728495447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54192.

The product of its digits is 2257920, while the sum is 50.

The square root of 728495447 is about 26990.6548086555. The cubic root of 728495447 is about 899.7923170996.

The spelling of 728495447 in words is "seven hundred twenty-eight million, four hundred ninety-five thousand, four hundred forty-seven".