728756741 has 4 divisors (see below), whose sum is σ = 729087084. Its totient is φ = 728426400.

The previous prime is 728756729. The next prime is 728756759. The reversal of 728756741 is 147657827.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 147657827 = 9461 ⋅15607.

It can be written as a sum of positive squares in 2 ways, for example, as 255520225 + 473236516 = 15985^2 + 21754^2 .

It is a cyclic number.

It is not a de Polignac number, because 728756741 - 2¹⁴ = 728740357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728756701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161840 + ... + 166281.

It is an arithmetic number, because the mean of its divisors is an integer number (182271771).

Almost surely, 2^728756741 is an apocalyptic number.

It is an amenable number.

728756741 is a deficient number, since it is larger than the sum of its proper divisors (330343).

728756741 is a wasteful number, since it uses less digits than its factorization.

728756741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330342.

The product of its digits is 658560, while the sum is 47.

The square root of 728756741 is about 26995.4948278412. The cubic root of 728756741 is about 899.8998822788.

The spelling of 728756741 in words is "seven hundred twenty-eight million, seven hundred fifty-six thousand, seven hundred forty-one".