728458778489 has 8 divisors (see below), whose sum is σ = 784653039240. Its totient is φ = 672287227776.

The previous prime is 728458778473. The next prime is 728458778609. The reversal of 728458778489 is 984877854827.

It can be written as a sum of positive squares in 4 ways, for example, as 4116505600 + 724342272889 = 64160^2 + 851083^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 728458778489 - 2⁴ = 728458778473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728458778419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5610854 + ... + 5739215.

It is an arithmetic number, because the mean of its divisors is an integer number (98081629905).

Almost surely, 2^728458778489 is an apocalyptic number.

It is an amenable number.

728458778489 is a deficient number, since it is larger than the sum of its proper divisors (56194260751).

728458778489 is a wasteful number, since it uses less digits than its factorization.

728458778489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11355019.

The product of its digits is 2023096320, while the sum is 77.

The spelling of 728458778489 in words is "seven hundred twenty-eight billion, four hundred fifty-eight million, seven hundred seventy-eight thousand, four hundred eighty-nine".