428521868 has 24 divisors (see below), whose sum is σ = 755290704. Its totient is φ = 212731200.

The previous prime is 428521861. The next prime is 428521903. The reversal of 428521868 is 868125824.

It is not an unprimeable number, because it can be changed into a prime (428521861) 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, 419198 + ... + 420218.

It is an arithmetic number, because the mean of its divisors is an integer number (31470446).

Almost surely, 2^428521868 is an apocalyptic number.

It is an amenable number.

428521868 is a deficient number, since it is larger than the sum of its proper divisors (326768836).

428521868 is a wasteful number, since it uses less digits than its factorization.

428521868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673 (or 1671 counting only the distinct ones).

The product of its digits is 245760, while the sum is 44.

The square root of 428521868 is about 20700.7697441424. The cubic root of 428521868 is about 753.9183775130.

The spelling of 428521868 in words is "four hundred twenty-eight million, five hundred twenty-one thousand, eight hundred sixty-eight".