428021722 has 8 divisors (see below), whose sum is σ = 645744276. Its totient is φ = 212773632.

The previous prime is 428021719. The next prime is 428021747. The reversal of 428021722 is 227120824.

It can be written as a sum of positive squares in 2 ways, for example, as 360962001 + 67059721 = 18999^2 + 8189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618183 + ... + 618874.

Almost surely, 2^428021722 is an apocalyptic number.

428021722 is a deficient number, since it is larger than the sum of its proper divisors (217722554).

428021722 is a wasteful number, since it uses less digits than its factorization.

428021722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237232.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 428021722 is about 20688.6858451667. The cubic root of 428021722 is about 753.6249533169.

The spelling of 428021722 in words is "four hundred twenty-eight million, twenty-one thousand, seven hundred twenty-two".