428043766 has 4 divisors (see below), whose sum is σ = 642065652. Its totient is φ = 214021882.

The previous prime is 428043739. The next prime is 428043779. The reversal of 428043766 is 667340824.

It is a happy number.

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

It is a super-2 number, since 2×428043766² = 366442931222925512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 107010940 + ... + 107010943.

It is an arithmetic number, because the mean of its divisors is an integer number (160516413).

Almost surely, 2^428043766 is an apocalyptic number.

428043766 is a deficient number, since it is larger than the sum of its proper divisors (214021886).

428043766 is a wasteful number, since it uses less digits than its factorization.

428043766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214021885.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 428043766 is about 20689.2185932674. The cubic root of 428043766 is about 753.6378908405.

The spelling of 428043766 in words is "four hundred twenty-eight million, forty-three thousand, seven hundred sixty-six".