428011729 has 4 divisors (see below), whose sum is σ = 436087476. Its totient is φ = 419935984.

The previous prime is 428011711. The next prime is 428011739. The reversal of 428011729 is 927110824.

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

It can be written as a sum of positive squares in 2 ways, for example, as 246490000 + 181521729 = 15700^2 + 13473^2 .

It is a cyclic number.

It is not a de Polignac number, because 428011729 - 2⁵ = 428011697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 428011694 and 428011703.

It is not an unprimeable number, because it can be changed into a prime (428011739) 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, 4037794 + ... + 4037899.

It is an arithmetic number, because the mean of its divisors is an integer number (109021869).

Almost surely, 2^428011729 is an apocalyptic number.

It is an amenable number.

428011729 is a deficient number, since it is larger than the sum of its proper divisors (8075747).

428011729 is an equidigital number, since it uses as much as digits as its factorization.

428011729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8075746.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 428011729 is about 20688.4443349422. Note that the first 3 decimals coincide. The cubic root of 428011729 is about 753.6190883243.

The spelling of 428011729 in words is "four hundred twenty-eight million, eleven thousand, seven hundred twenty-nine".