728760309 has 8 divisors (see below), whose sum is σ = 976768512. Its totient is φ = 483296160.

The previous prime is 728760299. The next prime is 728760311. The reversal of 728760309 is 903067827.

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

It is not a de Polignac number, because 728760309 - 2²⁴ = 711983093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728760509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635344 + ... + 636489.

It is an arithmetic number, because the mean of its divisors is an integer number (122096064).

Almost surely, 2^728760309 is an apocalyptic number.

It is an amenable number.

728760309 is a deficient number, since it is larger than the sum of its proper divisors (248008203).

728760309 is a wasteful number, since it uses less digits than its factorization.

728760309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272027.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 728760309 is about 26995.5609128612. The cubic root of 728760309 is about 899.9013509159.

The spelling of 728760309 in words is "seven hundred twenty-eight million, seven hundred sixty thousand, three hundred nine".