428309285 has 4 divisors (see below), whose sum is σ = 513971148. Its totient is φ = 342647424.

The previous prime is 428309279. The next prime is 428309309. The reversal of 428309285 is 582903824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 125305636 + 303003649 = 11194^2 + 17407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428309285 is a prime.

It is a super-2 number, since 2×428309285² = 366897687234422450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42830924 + ... + 42830933.

It is an arithmetic number, because the mean of its divisors is an integer number (128492787).

Almost surely, 2^428309285 is an apocalyptic number.

It is an amenable number.

428309285 is a deficient number, since it is larger than the sum of its proper divisors (85661863).

428309285 is an equidigital number, since it uses as much as digits as its factorization.

428309285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85661862.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 428309285 is about 20695.6344430414. The cubic root of 428309285 is about 753.7936878513.

The spelling of 428309285 in words is "four hundred twenty-eight million, three hundred nine thousand, two hundred eighty-five".