428809933 has 4 divisors (see below), whose sum is σ = 428881180. Its totient is φ = 428738688.

The previous prime is 428809919. The next prime is 428809961. The reversal of 428809933 is 339908824.

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 139877929 + 288932004 = 11827^2 + 16998^2 .

It is a cyclic number.

It is not a de Polignac number, because 428809933 - 2⁹ = 428809421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428809903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25668 + ... + 38941.

It is an arithmetic number, because the mean of its divisors is an integer number (107220295).

Almost surely, 2^428809933 is an apocalyptic number.

It is an amenable number.

428809933 is a deficient number, since it is larger than the sum of its proper divisors (71247).

428809933 is an equidigital number, since it uses as much as digits as its factorization.

428809933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71246.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 428809933 is about 20707.7264082757. The cubic root of 428809933 is about 754.0872750399.

The spelling of 428809933 in words is "four hundred twenty-eight million, eight hundred nine thousand, nine hundred thirty-three".