428722379 has 4 divisors (see below), whose sum is σ = 435988920. Its totient is φ = 421455840.

The previous prime is 428722373. The next prime is 428722381. The reversal of 428722379 is 973227824.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 428722379 - 2¹⁶ = 428656843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428722373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3633182 + ... + 3633299.

It is an arithmetic number, because the mean of its divisors is an integer number (108997230).

Almost surely, 2^428722379 is an apocalyptic number.

428722379 is a deficient number, since it is larger than the sum of its proper divisors (7266541).

428722379 is an equidigital number, since it uses as much as digits as its factorization.

428722379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7266540.

The product of its digits is 338688, while the sum is 44.

The square root of 428722379 is about 20705.6122585158. The cubic root of 428722379 is about 754.0359486082.

Subtracting 428722379 from its reverse (973227824), we obtain a palindrome (544505445).

The spelling of 428722379 in words is "four hundred twenty-eight million, seven hundred twenty-two thousand, three hundred seventy-nine".