428761321 has 8 divisors (see below), whose sum is σ = 431158824. Its totient is φ = 426370560.

The previous prime is 428761309. The next prime is 428761343. The reversal of 428761321 is 123167824.

It can be written as a sum of positive squares in 4 ways, for example, as 38303721 + 390457600 = 6189^2 + 19760^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428761321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428761351) 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, 172141 + ... + 174613.

It is an arithmetic number, because the mean of its divisors is an integer number (53894853).

Almost surely, 2^428761321 is an apocalyptic number.

It is an amenable number.

428761321 is a deficient number, since it is larger than the sum of its proper divisors (2397503).

428761321 is a wasteful number, since it uses less digits than its factorization.

428761321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3371.

The product of its digits is 16128, while the sum is 34.

The square root of 428761321 is about 20706.5526102246. The cubic root of 428761321 is about 754.0587782841.

The spelling of 428761321 in words is "four hundred twenty-eight million, seven hundred sixty-one thousand, three hundred twenty-one".