728813709 has 12 divisors (see below), whose sum is σ = 1133710396. Its totient is φ = 448500672.

The previous prime is 728813699. The next prime is 728813737. The reversal of 728813709 is 907318827.

It can be written as a sum of positive squares in 2 ways, for example, as 131744484 + 597069225 = 11478^2 + 24435^2 .

It is not a de Polignac number, because 728813709 - 2⁴ = 728813693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728813779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3114472 + ... + 3114705.

Almost surely, 2^728813709 is an apocalyptic number.

It is an amenable number.

728813709 is a deficient number, since it is larger than the sum of its proper divisors (404896687).

728813709 is a wasteful number, since it uses less digits than its factorization.

728813709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6229196 (or 6229193 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 728813709 is about 26996.5499462431. The cubic root of 728813709 is about 899.9233305059.

The spelling of 728813709 in words is "seven hundred twenty-eight million, eight hundred thirteen thousand, seven hundred nine".