303428721 has 8 divisors (see below), whose sum is σ = 405275104. Its totient is φ = 201934080.

The previous prime is 303428599. The next prime is 303428743. The reversal of 303428721 is 127824303.

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

It is not a de Polignac number, because 303428721 - 2¹⁰ = 303427697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (303428771) 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, 85915 + ... + 89376.

It is an arithmetic number, because the mean of its divisors is an integer number (50659388).

Almost surely, 2^303428721 is an apocalyptic number.

It is an amenable number.

303428721 is a deficient number, since it is larger than the sum of its proper divisors (101846383).

303428721 is a wasteful number, since it uses less digits than its factorization.

303428721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175871.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 303428721 is about 17419.2055214926. The cubic root of 303428721 is about 671.9736273487.

The spelling of 303428721 in words is "three hundred three million, four hundred twenty-eight thousand, seven hundred twenty-one".