428577785 has 8 divisors (see below), whose sum is σ = 518048136. Its totient is φ = 340359040.

The previous prime is 428577781. The next prime is 428577827. The reversal of 428577785 is 587775824.

It can be written as a sum of positive squares in 4 ways, for example, as 108597241 + 319980544 = 10421^2 + 17888^2 .

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

It is not a de Polignac number, because 428577785 - 2² = 428577781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (428577781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312146 + ... + 313515.

It is an arithmetic number, because the mean of its divisors is an integer number (64756017).

Almost surely, 2^428577785 is an apocalyptic number.

It is an amenable number.

428577785 is a deficient number, since it is larger than the sum of its proper divisors (89470351).

428577785 is a wasteful number, since it uses less digits than its factorization.

428577785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625803.

The product of its digits is 4390400, while the sum is 53.

The square root of 428577785 is about 20702.1203020367. The cubic root of 428577785 is about 753.9511685431.

The spelling of 428577785 in words is "four hundred twenty-eight million, five hundred seventy-seven thousand, seven hundred eighty-five".