428213681 has 16 divisors (see below), whose sum is σ = 514857600. Its totient is φ = 348367488.

The previous prime is 428213627. The next prime is 428213689. The reversal of 428213681 is 186312824.

It is not a de Polignac number, because 428213681 - 2¹⁰ = 428212657 is a prime.

It is a super-2 number, since 2×428213681² = 366733913191139522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (428213689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5900 + ... + 29853.

It is an arithmetic number, because the mean of its divisors is an integer number (32178600).

Almost surely, 2^428213681 is an apocalyptic number.

It is an amenable number.

428213681 is a deficient number, since it is larger than the sum of its proper divisors (86643919).

428213681 is a wasteful number, since it uses less digits than its factorization.

428213681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35848.

The product of its digits is 18432, while the sum is 35.

The square root of 428213681 is about 20693.3245516519. The cubic root of 428213681 is about 753.7375982786.

The spelling of 428213681 in words is "four hundred twenty-eight million, two hundred thirteen thousand, six hundred eighty-one".