428891907 has 4 divisors (see below), whose sum is σ = 571855880. Its totient is φ = 285927936.

The previous prime is 428891891. The next prime is 428891909. The reversal of 428891907 is 709198824.

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

It is not a de Polignac number, because 428891907 - 2⁴ = 428891891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428891909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71481982 + ... + 71481987.

It is an arithmetic number, because the mean of its divisors is an integer number (142963970).

Almost surely, 2^428891907 is an apocalyptic number.

428891907 is a deficient number, since it is larger than the sum of its proper divisors (142963973).

428891907 is a wasteful number, since it uses less digits than its factorization.

428891907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142963972.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 428891907 is about 20709.7056232096. The cubic root of 428891907 is about 754.1353239982.

The spelling of 428891907 in words is "four hundred twenty-eight million, eight hundred ninety-one thousand, nine hundred seven".